To get her attention, do something cool, special, and maybe a little out of character for you. We're not suggesting you post your feelings on the JumboTron at your local sports arena. That could be hugely embarrassing -- especially if she's not into you. Think small, but sweet gestures.
Take her to a karaoke club, request her favorite song and sing it to her (this works much better when you can actually carry a tune, but you'll get points for effort even if you're tone deaf). Or if you're not into singing, slip the DJ a couple of bucks to play her favorite song at a club. Then ask her to dance (a slow song works better if you want to cozy up close to her).
If you're really ambitious and have a bit of literary talent, write a few poems celebrating the things that make her so wonderful. Send the poems to a self-publishing company and have them bound into a professional-looking book. To really impress her, slip that book onto the shelves of your local bookstore or library and have her find it by accident.