Perhaps try asking around, of people who used to be her friends? It's possible one of them knew her personally or was close with her and can provide some information. I understand if you don't want to announce her name on forums. Maybe PMing some people can get some answers. Feel free to follow and PM me if you think that will help. I am sorry for your loss and I hope you can find out what happened to your friend.
Dear Sneak, I am so sorry to hear that. I personally have talked to many when they were on their low, so if I can be of any assistance don't hesitate to pm me. I'll do anything to help you sweetheart. Love, Semp