Most Helpful Girl
Plain and simple: She wants YOU to approach her and ask her out. Otherwise, she wouldn't be giving you all the giveaway signs that she's attracted to you and wants your attention. The ball is in your court so you have to make your move the best way you know how.
Most Helpful Guy
Chat to her. Ask her what she was up to last night. 1. Its a conversation starter. 2. She will tell you if she went to meet a friend or whatever. :) 2 birds, 1 stone