I feel like I probably should warn you...
Tread carefully when it comes to friendship with her. Her wounds and your's (not to mention his) are still fresh and raw. She's already shown to have difficulties being open and honest in relationships. Is that the kind of friend you need right now? Will the friendship help you both, or harm you? Or will it be unbalanced?
I can't answer it for you. It's just something to keep yourself aware of.
If it was me though? I'd probably take a break from her, with each of us agreeing to pick up the friendship at a later date, when things are a bit more relaxed and stable.