You don't have to talk to understand her issues. Advice I was given never use the MLC term around her or near anyone who will feed it back to her. Major league no-no. You can validate her emotions by being supportive, not critical. And by being suportive I mean being there if she wants to talk, you listen, she talks. Let her decide the flow of the conversation. If she doesn't bring up R/M, then you don't either. Don't try yo "fix" her or to analyze her. Analyze yourself and the type of person you want to be. Ask yourself, I fI didn't have her, what type of person would I be, what would I like to do, what would I want to do?
This is advice I have received and it works. The pain will not leave, so use it to give yourself strength. Do not pursue her. Do not email or text bomb her. Let her contact you, give her space and time. Her only reason to come back is to miss you. and if you are always around the corner and she can see you, then she can't miss you. It works. I don't know how but it does. Try to get into the mainstream with friends. Practice not talking about it (hard to do) with anyone. I try and fail at this all the time.
Try not to obsess over her (again very hard to not do). Calm down, breath slow, handle each day as it comes. I am 4.5 months into this nightmare and never thought I'd get this far. Best of luck.
