@Bruce Woodruff Everyone starts somewhere, so she has that going on for her. Not everyone jumps in this game with enough education, or some just hope to make quick money. Both get burnt from what my research indicates.
I am a new LL too in a blue state, but I did a ton of research before renting out, did thorough screening, and manage my rental myself in a class A neighborhood. My tenant had a higher credit score than myself.
In this situation, @Angela, you got a few things right, namely you got started. A lot of great advice here already, I would say put your REI boots on, start being a professional, and hire help, namely the attorney and the PM. At one point decide enough is enough, and you don't deserve this much stress over a single property in your life.
This person stopped being your friend a long time ago, I would say do the same. I had a similar situation with a roommate of mine before, and I use to stress too much. Since I moved out into a separate apartment, I have experienced so much peace.
Just my 2 cents. I might be projecting, but this is what I would have done if I was in your situation. And before your next investment, educate yourself thoroughly. Or decide if REI is really the right thing for you. We are rooting for you!