Rule number one... don't say/do/be like every other dude who approaches her on a daily basis. The worst thing you can do to attract a highly desirable woman is act extremely interested. The best thing you can do is get her to wonder why you are not chasing and obsessing after her.

When you do something that immediately sets you apart from the droves of "Can I buy you a drink. Please give me a chance! I'll do anything you want" crowd you will have her attention.

Then you must carefully communicate indirectly and often nonverbally, that it is her who should be seeking your attention. Confidence is the fundamental mechanism by which this is nonverbally communicated.