We also timed debt markets well - sometimes the stars align - where experience and preparation meet with taking action.

You need a plan of action before closing.

This internal conflict has reached the point of action paralysis.

Some have no IDEA>>>Give her instructions to text you with repairs so you have a record of her request or to email them.Give her instructions she is not to disturb other tenants,,"re dog poop" that you've had a complaint and if she continues to disturb other tenants you'll take action...  

They have 3 years after the action within which to redeem, which will cost them taxes plus interest.

Here are a couple take-aways for you.Consider offering MTM leases in the future, as you can more easily disentangle yourself from someone whom is not fitting in and messing up the feng shui.It wasn't required this time, but every time you have a "conversation" with a tenant, always memorialize it in writing by sending a letter, restating what was discussed and the action steps that were agreed to be taken. 

I have an in-house property management team and it works - I like it because I can control costs, be quick and actionable on delinquencies and other things that may come up.  

There is no need for you to get involved, and telling them this is your best course of action.

Is there any proactive action I can take to highly discourage this abandonment or will I have to take the steps for abandoned property? 

Networking and learning and taking action steps to reach my goals.