Since a "friend" is reaching out, then connect w/her. When she begins to ask questions, you can be honest about what is going on, but there is no reason that you need to tell her everything. I would test the waters w/her for a bit before I shared quite a bit w/her.
Everyone needs someone to talk to you and you have to be the one to decide who you are going to allow into your "inner" circle at this time. If you eventually feel safer w/her, then you can provide additional info.
Time will tell if she's just fishing for info or she truly is wanting to be there for you.
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.
