I'm going to assume she just doesn't want the lame stuff every other guy gives cause it has no meaning to it. So I am going to say make her something. go to a craft store, pick up a bracelet kit, some letter beads, etc and make her a bracelet with her name
1) Its not store bought, you took your time to make it <- shows you care
2) Its not generic & I don't see many guys doing this at all <- shows your willing to take a chance
It doesn't have to be a bracelet either, you can be creative.
edit:
& while you are at it, make a matching one with your name

I would also write her something, like the meaning behind the matching items, etc.