I so Agree with Chakara
But not sure about his requalify . . it could be possible for her to shoot you down then! ? you'd have to play your game tight but
What I've done is . .
Not pay attention to her . . every guy is giving her eyes/flirts/pick up lines etc & your the only like guy that hasn't hit on her all night. But don't leave it too late . . she will think your not interested but you have to judge a good time. She will be interested in why you havnt like payed attention to her.
But when time is right I've got up and ' negged ' her , also as a disqualifer and that she coundnt flake me off, also is important is to reframe yourself in her frame e.g body language , talking, movement ( Quickness ) say she goes gets a drink - her arm moves fast to get it and you may slowly grab it but every small bit is important, because she's not one to come down and be your bitch . yet

she's to high for that at the moment, so go into her frame , play your game not too hard at the moment because depending on her mood she could still flake you off! But when your in her frame and you mold into her ' say ' she will come down off her high chair and not be too attention seeking because your close now - she thinks she knows you! So know you be her alpha male and she should follow! lol
And play your game! this can be done & I've done this before, helps a lot
Hope it helped
Jaffa