Walk up to her and say "Can I borrow a dollar? because I wanna use the pay phone out front to call my mum and tell her I just met the girl I wanna nail in the bathroom." and then when she looks at you in disgust say "Don't flatter yourself darling, it's not you." and then hold out your hand for the money. Do your biggest smile and don't lose eye contact for this entire process and it's sure to work.