So sorry....I know this is tough. 18 is a crazy age...wanting to "find yourself" and experience the world/independence. It's hard to know what is in her head, but trust that you have given her the skills & tools to handle what is out there.

You don't deserve to be in pain - she made this choice - not you. It is not your fault!

Patience is so hard to endure, but believe that in time she will come back to the nurturing and support that she knows is waiting for her.