The price displayed is the Opening Bid amount of $83,314.49.

Based on the behavior you've described I don't think I'd want her in my rental anyway and would offer her a deal to return the keys and leave, but I wouldn't do this without there being a consequence to her (deposit forfeited, rent paid for the time she's had possession and possibly lease break fee).  

Newbies have no clue as to what is ethical, they don't understand the industry and therefore have no clue as to what acceptable behavior might be.

Every situation is different, so there may be reasons to simply bend over for them, but you are enabling and enforcing their behavior and making all the other landlords out there have to work that much harder to compensate.

You let this go, it becomes learned behavior, and she may start paying whenever you want.That's the principle.  

Is this behavior within the rules of the site?"

Personally I would take care of the repair as a show of good faith and understand that this behavior fosters a good relationship between landlord/tenant.  

That's just more of the same outsourcing behavior that has gotten ou into this situation. 

Google is a great way to find out quickly what people are searching for and Google Display Network is oriented to people finding ads but not necessarily looking for you, your product or service. 

I don't believe in financially rewarding bad behavior.