How to get her
Being mysterious is the best way to catch her attention.

Competition
Gohan. Frankly, even making allowances for the stupid clothes, you may be in over your head here, he's strong, intelligent, has a great body, and isn't a heartless bastard. Lots of luck. You'll need it. Mybe if you promise you'll never make her dress up as a Power Ranger...

She likes you if...
She follows you around (think almost stalking). Of course, if she changes her hair for you, then you know you've won the battle.