There are 3 courses that have recently come to my attention about tax lien certificates and tax default properties either from others on this forum or from other real estate investors I know.1) https://www.taxsaleacademy.com/2) https://tedthomas.com/3) https://taxlienacademy.com/I think all 3 courses range from $1500 - $2000. 

For example, Indianapolis is a market that’s been attracting a lot of attention from investors lately because of its affordability, solid rent returns, and growing population.

It does well as it attracts medical, academic, athletic, and entertainment.

What are some things to pay attention to / negotiate?

I've focused my attention in the area between Hwy 44 and Gravois Ave from Tower Grove Park down to River Des Peres for a nice intersection of price and condition.

It only takes a few people to report someone to get an AG's attention.

And with your medical experience and real estate experience--not to mention your knowledge of medicaid billing--I don't think you need him.

The advantage of the law firm is they will do it every time they come up for appeal and you will not have to pay attention to the deadlines. 

Thank you in advance for your time and attention!

You could start reporting her late to the credit bureaus(it would get reported once it's 30 days past due), that might get her attention.