This is a most-unfortunate situation - while you can certainly void the lease you will still need to go to court - because she, obviously, is not going to go away quietly. In my opinion, you do have a case because she did not use her legal name - and that is what you will need to prove. You will need to gather all the information, data you have from the background check, etc. Now, if she has her Driver's License in her maiden name and has gotten the use of her maiden name back via the courts then you might hae no recourse - as then she did indeed use her legal name.
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