1) she doesn't HAVE to go back full time. You think she SHOULD go back, but her finances aren't your problem anymore. Let her figure it out.
2) I wouldn't focus too much on the status of the Divirce proceedings. There's tons of reasons she could stall and not be related to the feelings she may or may not have towards you. As you just said, maybe she doesn't WANT to work full time?
3) the only resolution you could get right now is divorced. She isn't going to choose your M right now. So what exactly would you want to do?