Should my property manager visit her to persuade her to vacate rather than wait to be evicted? 

All in all I would say the biggest red flags that I'm not sure I could've anticipated without experiencing it for myself were the lack of commitment to the project, lack of project management skills, and lack of planning ahead/ anticipating lead-times of materials.

So from a financial standpoint, if you can continue paying the minimum and putting any additional into income producing investments that can return a rate higher than your interest rate, you will net ahead.  

Figure out how much time it will take for each visit, the complexity of what you're asking them to do, then negotiate something you both think is fair. 

If you don't take the standard deduction (and most do these days) you could deduct the interest on your mortgage.Looking ahead to next year, you'll file a Schedule E.

Because of the other homes in the neighborhood posted I'm not overly concerned, but want to see if there's a good way that I can find out ahead of making an offer? 

I would definitely go ahead with this 203k loan.

I have made some estimates on cost, and I have already visited the site with several different contractors to affirm my thoughts on Rehab. 

And when you do that, not only were you already ahead on the real estate side, but you become much, much further ahead.  

I am humbly seeking advice/constructive criticism ahead of my small multifam new-build project plan in mid-2022.