By all accounts, she was an incredible idiot (she didn't even bother to show up for court, how smart could she really be?). Even if the cash was not in the PayPal account anymore (according to some, the PayPal account was hijacked by one of the people Reeves screwed and no one had direct access to it), you can't move sums of money that size around without setting off warning flags all over the banking system (anything over $10K is automatically reported to the IRS, without exception). That is easily traceable and now that the court has reached a verdict, those assets are already being hunted, if they weren't already captured (asset freezing is most certainly done in civil cases, its just far more common in the criminal ones). That means the only way she could could leave the country with any of the money is if she had it in liquid form (cash, gold, bearer bonds, diamonds, etc.). You can't legally remove that much money from the US without declaring it and it very easily shows up in a standard border check/airport scan (except maybe the bearer bonds, they just look like a piece of paper), so she would not have been able to sneak it out.
We are not talking about a Wall Street financial shark here, we are basically talking about a bumbling con artist. There is no way she was smart enough to move the money to a secure offshore bank or anything; she probably spent a ton of it on stuff (I got me a new plasma!), had some in cash and the rest in the bank account attached to the PayPal account. All Blizz's collection team would have to do is go to her house and take it all.

Scapegaming is gone? Thank God. While I'm not a WoW player, several of my friends are, and they would talk about how this asshole was the most hated person in the private server community.

You're thinking of moving the money in a lump sum, but as the money was collected over a fair amount of time it's almost certain that it was dealt with in small chunks. I imagine it's still quite traceable (as you mentioned we're not talking about a financial genius likely to have set up numerous offshore accounts), but I still expect it to have been moved out of PayPal shortly after it was deposited. Additionally, I imagine a significant portion of the money has already been spent (going through a good chunk of $3M over several years isn't particularly difficult, and I somehow doubt this woman was a paragon of fiscal responsibility), which means that the property purchased with the money will probably have to be dealt with when the woman inevitably files for Chapter 7. Additionally, the freezing of assets in civil cases typically requires a separate court order issued after judgment (the exception being when the ownership of assets is what's contested, such as joint accounts in divorce cases). It's also my understanding that a plaintiff who is simply owed money has to show very good cause why assets should be frozen instead of going through the standard debt collection channels, and I'd be very surprised if a court froze assets following a default judgment.

Yes... there's more than a buck and a quarter involved, so yes... they'll hire a private detection firm to track her -- which frankly, ain't gonna be too hard -- and they'll chase her down.
It isn't like thugs are gonna be kicking in her door at the Mexico City El Ramada Inn and jacking her up with baseball bats or anything... but she'll be hounded... and there will be criminal charges... and her life will suck.
It is a shame too... because she could have answered the charges and lost the 3mil and maybe walked away with no real permanent damage.
This is a corporation we are talking about. They don't have friends. They don't have families. They don't have souls. They don't have any inhibitions. They do one thing. They destroy through consumption. They will not be stopped. They will not be negotiated with. They want to consume what you have, no matter how valueless it might seem. They don't know anything else... except to feed to sooth the never ending hunger. They are machines of perpetual killing. Once you are in their sights, they lock on and never let go.
This girls life is over.
Yours may be next.
Come with me if you want to live.
(insert Terminator music here)

You still can...

Actually, no, I wasn't thinking about her moving it all in one big chunk, I was thinking about the fact that they were only taking donations for a couple of years before Blizz dropped the lawsuit on them and in that time they made over $3 mil. If the money was being moved out of the PayPal account regularly, we are still talking transactions that totaled over $100K a month, on average. They had to have left a banking trail as wide as a California freeway with that kind of cash flow.

Why was she so hated? Was it because of the whole "donate for epic loot!" thing?

That reminded me of this pic/story (don't worry, it's family safe)

Search YouTube for "Scapegaming", there are a couple of videos on the subject. Alyson Reeves is referred to as "Peyton" in them.

I'd have thought that not turning up was essentially the same as admitting guilt. Under those circumstances I'd sort of expect that connected actions like freezing assets would be automatically granted

Not showing up can many things, from the person knowing they're completely guilty and running the moment they receive the summons, to the person never having been served and being completely oblivious to the lawsuit even occurring. I'd be very surprised if the court froze assets following a default judgment due to the remarkable potential for abuse (file lawsuit, don't tell the person, get default judgment, freeze assets, then the person has very little means while trying to contest the judgment). Then again, considering how absolute fucked the US justice system is maybe I shouldn't be surprised if that happened.

But surely the court system is the one that tells the accused that they have to show up in court, not like the accuser can really prevent that from happening (well bribes could I guess but these are LAWYERS we're talking about and if you can't trust a lawyer, who can you trust?)

Typically for civil cases service of process falls to the plaintiff or their designated agent (usually the lawyer). The specifics vary by state, but in some cases can require that the person delivering the summons be a licensed process server, while in other areas service simply through the mail is permitted. It really is something that should be handled by the courts, but the reality is that much of the time it basically comes down to the plaintiff saying "Yeah, I handed the notice to the defendant and my buddy here was witness to it."

Actually, in many states you would want the buddy to deliver and you to verify. I'm not saying it makes any sense but if you want to know how civil suits work in a particular state just look up how to serve your spouse for divorce in that state. Divorce is a civil suit in all 50 states (one of the reasons divorce generally turns nasty, imo).

Sorry, I wasn't paying much attention until I stumbled onto this. Then for no good reason, my survival instinct kicked in, and I jumped out of the window. Now I'm writing from the hospital, where the abusive nurse thinks I'm having a shit in the bathroom. Little did she know that I always pack a small laptop on me for just such an emergency. It also doesn't show on the regular "this guy is fucked" medical search.
What a great experience, kudos for that.

For anyone still interested in the reason behind the awarded amount, gamepolitics has a breakdown.
"The ruling was handed down on August 10 the U.S. District Court of the Central District of California and targeted Alyson Reeves, who was operating under the business name of ScapeGaming. The huge dollar figure was calculated by combining the $3,052,339 the defendant received from users of her service via Paypal, statutory damages of $85,478,600 (calculated by multiplying ScapeGaming’s 427,393 users times the statutory minimum of $200 per “act of circumvention and/or performance of service”) and another $63,600 in attorney’s fees."