Two ways to play this, 1-on-1 and your game will have to be tight and the attraction high to avoid her flaking or (the better IMO) hang out in a group takes the pressure off you and makes it more likely for her to come. Take along some of your guy friends to wing, then isolate (just search it on the forum if you need tips) and she is yours
ooh also don't underestimate the power of running game on her friends if they like you even in a friendly way they will actively help the pick up along. Just make sure you don't give IOIs to them or things can get a tad loco.