If she is being considered for benefits and you feel you had amble grounds to dismiss her, something is awry, e.g., she lied on her application.
I could tell you real horror stories about employees who aggressively turned against me after I let them go. Even nice people can get wacky when shunned. Beware.
Aside from consulting a professional in employment law, be sure that you have locked her out of everything--deadbolts, accounts, passwords, and if there were any accounts of yours with whom she dealt regularly, you might be wise to contact them so they are clear that she is not employed by you (but your attorney can advise you about that).

