One of the most common complaints I see on reviews is how the area, location, or house did not look like they thought it would or was promised.

what kind of investment was/is this  a little more detail may protect others if you think this person is a financial predator.  

I suppose my question on this is: Is her simple statement (which came in a text, btw) to me of "I'm moving out," enough for me to take this kind of action?

A famous quote: Do unto others as you would have them do unto you” is commonly known as The Golden Rule.

Common area TV/internet. 

The most common reason for a high water bill is a toilet that constantly runs or flushes.

Multifamily is the most common one, but some groups also do self-storage facilities, student housing, commercial properties, and others.3. 

This is fairly common when people want anonymity.

I'd consider doing some kind of cash out refi on the property at a number you're both comfortable pulling out, while still leaving $ for reserves to maintain the STR you currently have.

@Jake Andronico, thanks for that kind shout out.