Did landlord send you a letter too?
No they didn't but I'm pretty sure it's a scare tactic. It will probably take longer to do anything, by the time you will be gone.
If she uses a lawyer to sue you just ignore it, look at the other thread where a guy is being owed US$165K and even with lawyers involved the money owing guy just ignore its LOL
ONLY THE GOVT can seize your money from your bank account, the rest can just keep scaring you to pay.