Alright, what you're going to want to do is buy a few things:
1. Sniper rifle
2. Smoke gernade
3. Bouncy balls (a dozen, preferably)
4. Sticky notes
5. Katana
6. Calculator
So, find a spot where you have a bird's eye view, grab the sniper rifle, and shoot the nearest person next to her. Next, throw the calculator at her, and if you miss, shoot her (game over). If you succeeded, grab the bouncy balls, cut them all in half with your katana. Now, put them on the floor. Next, grab your sticky notes, cover your body entirely of them, then dramatically fall to the floor. If you did it right, 2423 red dolphins should appear and start gnawing on your crush. She'll know you love her. :') True love is beautiful.