well.. if something is up.. She should be the one making the first move. You are in no position to crack onto her considering you're the one that got 'rejected' in the first place... It just seems a bit... clingy? i dunno?
But watch it, doing something sexual or making a move may ruin your friendship with her if she does not wish to further on the relationship.. Example: I have some female mates who are just naturally flirty. Kiss me on the check, get touchy with me, dance with me etc.. but i know if i went in for the kill it would be a disaster.
But, if she is interested, and you two are gonna get mega pissed soon... I'm guessing some fireworks will be let off that night. But if nothing happens and she keeps on flirting with you, talk to her. Tell her how you feel and how you want to go further with her, but also ensure her that if she choses not to date you that your friendship will not change.