I definitely agree with Derby regarding your friend being afraid of her sexuality and that is a journey she will have to work through within herself. No matter how willing you are to explore and assist her in her explorations, she has to embrace self-comfort and allow self-exploration. It is definitely a long road of fighting oneself, especially, when you've embraced mainstream views for quite some time.
I would also say that it would be a good idea to express yourself, openly and transparently, to her so that she will know where you are coming from and what you see and, hopefully, that will open up a dialogue.
I hope all ends well.