You might try paying more attention to her. Let her know your thinking about her. Send her a text every night before you go to bed and every morning when you wake up. When you have the time call her. Just because your thinking of her.
Also poetry. Assuming she's into written forms of art. Writing poetry will not only tell her how you feel it will show her how you think.
Regardless of how you go about it. Make sure she knows how much you care about her