You can call her tomorrow or today. Be that funny interesting person, that you were at night when you met her. Also if you just chat a little bit before ask her going out, may be plus for you. Anyway you don't loose nothing, because any approach is experience. Even you blow your chance to take her to your bed, you are gaining experience and as Mystery said, when you do this lot's of times, you are calibrated and you know every situation you can be in and know how to act. Also, I think it's good to think for the pick-up as making your skills better instead of trying to get laid with girls. One girl you sleep with is nothing compared to the person, that is interesting for many girls in which you can find even hotter/better girl.
Wish you good luck and don't forget to share what happened
