Well I have seen this come into play - I had someone who has a note in florida that was a non-owner occupied loan and the lender claims the borrower failed to make payments on this and attempted to record the deed in lieu.

Ideally I’d like to get to $10,000-$15,000.

If you play your cards right, this could be a great way to build equity and add value to the property.

2) Many flat fee PMC's charge whether property vacant or occupied, tenant paying or not.Lots of games also played with Maintenance fees.

I deal with it in all the subdivisions I have built..

Here's an ideal PM contract: The two keys are: The PM is incentivized to make you money, not charge high fees, and is contractually bound to provide reporting that you can understand in a timely manner. 

How do I deal with her and is it a lease violation?

they are kidding themselves one needs to punch in 50% to 55% of gross cash flow for expenses then deduct your mortgage payments.. anything less than that will not play out over the years.

I was hired to get things back on track, but she wouldn't play ball, so I filed for eviction.

If your tenant has been playing these "schemes" then likely they've done this with the previous landlord and gotten away with it - so I hope you bought the property for a good price in order to account for this potential headache.