The good thing, I guess, is we have a paper trail of all these conversations and if push comes to shove, we have documentation to prove the headache in this ordeal. 

No, probably not, at 60% LTV, yes that may fly with less concern.Much of it will be about the deal, the parties, collateral, LTV, and how much reliance there will be given to an audit trail of the transaction.

I would post on her door and document, so at least you have a paper trail once this lifts.

Start the paper trail and send your tenant a Pay or Quit Notice demanding payment for short rent.

One they find a way in, the constant pee trail will leads others in also.

Ask for a trailing 12 month P&L....ask for copies of all bills for the last few months.

You can rely on those numbers initially to move forward but I would still want to see copy of all of the trailing 12 receipts.. 

This gives you a paper trail to prove you addressed or attempted to address her problems.

Her lease didn't say anything about a last month's rent and the sellers didn't turn over a last month's rent, only security deposits for both units; I told her that and asked if she had a receipt or some paper trail but she didn't.

In my non medical, amateur but fact based opinion, by mid summer, when everyone goes back to work, everything goes back to normal, and politicians on the campaign trail vie with Kim Kardashian for the American voters attention.