Glad to welcome a new member.
One thing to keep in mind is that people don't choose to be gay or lesbian. Back around 1987 I went to a political debate that included discussion of gay rights. One of the candidates said "No one chooses to belong to a group that is so despised."
I'm actually a straight woman, but I've always been sympathatic to "queer" people because I was a really nerdy kid with thick glasses and no social skills. I have some sense of what it's like to feel that you don't fit in anywhere and can't be yourself. Adolescence is tough enough as it is without being lesbian. Your daughter needs all the love and support she can get.
I see so many stories in the news about gay kids committing suicide because of homophobic bullying. Please make sure your kid doesn't become one of those statistics. (Yes, I know what it's like to feel suicidal too.)
The fact that you've joined this site indicates that you're not going to reject your daughter out of hand. Good for you!
This website once helped me get through something traumatic and I'm sure Soulforce can help you and your family as well.
All my love to you and your family!