I'm an expert at this. Basically, you have to bully her. Yes, thats right, bully her. Make fun of everything you can think of. Call her short. Laugh at her because shes rich. Girls never agree they're rich. Everything they say, you want to bully them about. Thats really all you need. Not so far she cries, but as long as you're on the edge, thats really all you need. Ask if you need any examples/further explanation, but thats really all you need aside from practice.
Nix, girls love sexual tension. You want to go one step further than she wants (experience will tell you how far she wants) and then stay there until she feels comfortable. Then go further some more. Creates a little exitement.
Q.E.D. girls flirt by generally being slutty, innocent, and cute all at once. So you want to give the message that you're up for it yes. You want to give the message that you're innocent. Self explanatory really. And you want to be cute, so all that making yourself look small *******s that girls do. I'm pretty sure you know what I mean more than I do, but theres just a pointer.