HI!
I don't see any huge difficulties here. She was your friend before she came out to you and that hasn't changed. Just an extra hug and an "I'm happy,if you are happy" is all it takes. As a gay woman who was never "in" I never had to come out One's sexual orientation is but a small part of the whole person.Just keep on keeping on with the friendship and I think all will be well! Shad