The issue is whether she is a bonafide tenant. You need to personally consult with a landlord tenant attorney in your area. She may be right. The bank may have to give her 90 days notice to terminate her tenancy provided she pays rent. You, or your attorney, may have to further negotiate a resolution with the bank and with the tenant. Good luck.
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I presume you still reside in the home and that you let her move in as a roommate. I also presume she is now making threats of violence. ;) Go to court and get a temporary restraining order (TRO) against her. Then, call the cops and have her removed for trespassing and/or violating a TRO. It doesn't matter that you are no longer the record title "owner", so long as you are still in rightful possession of the property and have not yet relinquished possession to the bank.