Take 24 hours to let your emotion cool down then get on the phone with your attorney.

Better by letters or maybe even email.Also, be sure to keep all emotions out of your tone and responses.

I would take your emotions out of it and explain that she has a choice; she either pays the late fee and all is good, or she doesn't pay it, assuming your lease is written this way, she will be considered behind on rent for the month, late charges will due for the next month, and so on, and at some point you will file an eviction for unpaid rent, and once eviction paperwork is filed with the county, other landlords will see that when they screen and most likely deny her rental application.

You are the completion...The competition is bidding with logic and reason so they will stop bidding after a few thousand above the lien or if they think they can collect a years worth of rent before the bank foreclose they spectate rent rate x 12 - expense = profit .You on the other hand is bidding based on the emotions and personal attachment with the advantage of being able to hire a foreclosure defense attorney to stop the bank.

Everyone needs to know there is a difference between an actual ADA service animal and an ESA  (emotional support animal). 

Take the emotion out of it.

Email and texting is not a good choice for communicating sensitive and emotional material.

We will expect actual damages of approximately $500 for the cost of having a locksmith remove the illegal device, another $9,000 for loss of the prospective sale profit, and an unamed punitive damage claim based upon your intentional interference with our property rights and intentional infliction of emotional damages.

This is about the math, then it is about the math, and after the math makes sense. . . you can then be a big emotional teddybear bout the property.At some price, this becomes a viable and cashcow, moneymaking vehicle.Get a foundation contractor out there and assess the rebuild cost on the property, electrical to look for any Knob and tube wiring, and a plumbing contractor to discover water pressures through the properties.Also, have you thought about Section 8 landlording?

I will use this situation as an example of why business and emotion need to be separate.