Hmmm, that is a good question. I would say ask her out now. It's better not to wait b/c you never know who else is expecting to ask her out and someone could beat you to the punch. Why don't you first just ask her to hang out as friends, like maybe in a group setting when you and your friends go somewhere or do something, and see where it goes from there. That way you can make it seem like not such a big deal and it won't be awkward either.
My 22 year old