linkwanabe, just tell it to her straight - You're not interested.

Jordan L: Everybody has that fear of rejection. I don't think anybody has ever not been nervous when trying to ask someone out. You just have say to yourself 'today I ask her'. Wait for an opportune, quiet moment away from everyone else. Then, just ask her out. You could pretend she wasn't there if that would make it easier to say (although, it might be a bad omen for a relationship if you pretend that she's not there). If she says no, she says no. If she says yes, good on you!