The conversation may not even touch on her wanting a divorce, but to be prepared...listen to what she has to say. Remind yourself that what she is voicing about her feelings that they are her feelings to own at this time. She is looking at her life through the looking glass and she's trying to grow up in Wonderland, which means playing dress up for a while until the right personality/outfit suits her.
Listen and validate whenever you can. You can always say "I'm sorry you feel that way". Do not argue w/her because no matter what you say, she's going to continue feeling the way she is right now. Don't give her any additional justifications as to why she left. You'll know if what she's saying is memorex or not.
If she raises the issue of divorce, you can always say that you need time to think it through and that you are not willing to agree to a divorce at this time. Don't offer to start the proceedings...this is in her court to do.
Treat her as a friend that you've not see in a while. It's better if you can do that.
Good luck! Try to stay calm and keep your temper in check. Speak in a clear, calm and concise voice.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
