With a shitty ex situation there's bound to be some issues so for your own sake I wouldn't rush things. Nothing wrong with hanging out with her but I have a policy of never bringing that kind of shit up with someone unless they at least get near the issue without any input from me, regardless of their gender. Sometimes dwelling on the subject only makes it into a bigger deal than it needs to be. People are good at sorting shit out on their own and if they're reasonably normal they go to others when they feel the need for input. If she asks you about stuff and you give her good advice then she will continue to ask you about stuff. Hang out with her, if something happens then it happens. Just don't become her surrogate shrink because that has its own set of issues.