Look, I don't want to speak out of line here, and I'm not sure how deep the disappointment runs, but I do want you to know that I sympathize. Having my own referent for this situation, I'm not going to pretend to give you any advice, since I really have none to give. Those questions are best unasked and forgotten, but if you're anything like me, you'll find them very hard to conjure.
Still, if there's one thing that I believe you should do, it's to maintain your friendship with her. That's something you rarely regret, especially once the initial chagrin has faded; and trust me, if you find her special, then there's a reason for it.
Life is full of surprises, they say, and even from my very limited experience I can concur. These surprises, they come good and bad, joyful and sorrowful, and sometimes the best thing to do is simply to sit back and wait for the next one to arrive.
There are times I like to say to myself: "Something always works someday". Maybe it sounds stupidly naive, and I'm not even sure if it's grammatically sound, but no matter -- other people have told me that it's true, and for once I'm inclined to believe them. Because all things considered, it really does help.
Of course, I may also be blowing this out of proportion, and if that's the case, you can blame me for projecting my own emotions onto someone else's life. But one way or the other, here's me wishing you, as sincerely as can be: good luck.