You are rationalizing. She TOLD you she isn't anywhere near 100% She actually told you she was using you. She wants to be married and miserable to see her son.
When someone says something, LISTEN
Actually, I'm not. I'm aware of what she says. And I also have made some phone calls and sent some emails to the mediators and an L (as well as a lot of research), so I got some advice on where to go next.
She came over with S for dinner. We didn't talk about the situation, but she started cleaning up S's room. She was pretty passive-aggressive the whole time. It went okay I guess, but I think I figured out her angle.