for the love of god TALK TO HER!!!
I just found out that a good friend of mine liked me last summer (maybe still does, its a bit fuzzy...). And of course, I liked him as well. But he never said anything. Neither did I, because I never thought he would like me. He admited this to me a few weeks back. But of course he's seeing somebody now.
I'm kicking myself for not speaking up,and I want to kick him as well for not saying anything to me
Since you're good friends, it'll be okay. Even if she isnt interested, you'll come through it okay. Best of luck