well it sounds like you've done the right thing by forgiving her, and from there, it's just going to be a up to you to work things out with God. It must hurt a lot, but healing from that kind of shocking news takes time. Just realize that nothing is going to change the past, obviously it's not like your going to wake up tomorrow and she's going to say "haha - i was just kidding"... so you're going to have to accept the fact that she's truly sorry for what she's done, she's repented, and God has forgiven her. You have to live up to the true forgiveness that you said you gave her. Rejoice in the Lord that she's a new person now, and that she realizes her mistakes. Help her to live the christian lifestyle that she wants to live now.