Google did the exact same to me, my google account was shut down by an irrate ex girlfriend within two hours I try to reactivate it and did only to find EVERYTHING I owned via google WIPED CLEAN, I am living in UK on universal credit meaning can barely afford to feed the family but was robbed of hundreds of pounds worth of games and anything linked to my gmail, one that has been active for years just robbed from the richest company in the planet against one if the poorest individuals.
What I do, nothing because terms and conditions mean no rights if challenging, glad a big company has said something google are scum with these policies.
Did she hack your account, or did she have access that you provided to her?
Give multiple factor authentication a chance, and pay attention to emails regarding breaking terms of service.