why don't you just hang out with her alot and have fun and when she realizes that she has alot of fun with you and her eyes sparkle when you look at her you can steal the sparkles and sell them for some easy cash okay
no but seriously any girl wh ohas ever liked me liked me because I was fun or smart or something so try doing that also it doesn't require any sauve pickup lines it just involves you keeping her entertained and happy and not being a weirdo. That's what I'd do until it seems like she likes you alot then you can start trying to be her boyfriend.
Sometimes if you're fun for too long though you become a friend or something so you have to be careful with that maybe make some high sexual tension jokes then act like you don't care afterwards.