My friend is a lesbian and she wants to change?

I have this friend who just discovered who she was last year. To us, discovering who we really are is a fantastic thing, but she dreaded it. Sometimes, I even blame myself- that I am the reason why she's hurting so much.

Ever since last week, she told me she wanted to change. It hurts me to see her like that. Just a few minutes ago, she send me a text message saying the same thing and asking for advice. As a friend, I should know what to say. I'm ashamed because she believes me and I couldn't do anything. I didn't know what to say. I understand her, but I just don't know what to do to help her.

Those who knows about her sexual preference accepts her, but she can't. I want her to know that I am always here for her no matter who she is.

But I also want to help her if she wants to change. Do you have any tips?