Phil, if, at the very least, you like this girl as a friend then keep treating her like one of your friends. If you ignore her and she gets pissed at you, then you have even less of a chance with her than you do now. I know it's tough since you laid your heart out for her and she stomped on it but it'll get easier as time goes on. And, who knows, she might reconsider and decide to go out with you. In the meantime, don't pass up any opportunities to date other women. You may think this gal is perfect and the one for you but you two may not be right for each other once you start dating her and get into a relationship. You may find out something about her that would just really turn you off.
Or, if she's a betting woman you could bet her dinner on some piece of trivia. Like Richard Nixon's middle name was "Moe". You bet her it's Moe and when she finds out it's Milhouse, you lose the bet and get to take her out to dinner. Just like Todd Gack.