I also consider myself a Christian and I am gay. Please tell her she is not alone. There are many of us who do struggle with the issue of our religion, primarily because of what the homophobic bigots have turned this all into: a maddening, frenzied, hate filled buffet of venomous vitriol. Their message of destruction still can inflict some lashings, although not to the same extent anymore as in my younger years.
I realized that God made me the way I am, period. I am not imbibed with an "evil spirit" as those religious fundies always say we are; I try to live a good life, and I succeed most of the time. (As humans, we cannot be perfect, ever.) I have been together with my partner for almost 10 years, we have a life together filled with love and happiness. I am happy and fulfilled that I am blessed to find people who love me the way I am.
I am hoping you can do the same for your friend. Most of my gay friends are either Catholics and Protestants, and I can say that we have found a way to integrate our faith quite seamlessly with who we are. And I think that might be a good point for her to think about, faith versus religion, because those two are not the same thing. (I hate organized religion. They represent everything that's WRONG with how to practice one's faith.)
You sound really concerned about her well being. Believe me, she has gone through a rough ordeal, trying to stifle her sexual feelings to please you or whoever she thinks will judge her. (Any gay Christian knows exactly what that takes out of a person. It kills your very spirit.) Let her know that you won't. And that you will be her friend no matter what.
Be well, and good luck.