Tread lightly my friend. You can't mind read and know what her intentions are. You need to protect yourself first and foremost.
If it's me, I'd try to be open to conversation, but not eager, if that makes sense.
You don't want her to get the sense that she can come back whenever she wants to and you guys get to pick up where you left off.
If she wants to come over to visit the boys, remember that it's your time with them. I'd even go as far as to tell her which room she should be staying in when she gets there. It's your home remember, and as far as you are concerned, she's a visiting guest.
Nosey neighbor treatment. Polite and friendly, but not an open book is how I'd play this.
If she wants to initiate R talks, then that's your call to make as to what to do, but let her make that decision.
Again, this is my opinion and others with more knowledge and experience will be along shortly to help you out.
