How do I montrer up the stable snob at a montrer tomorrow?

I know, I know. I should just be going to have fun and do my best, not to montrer anyone up, and I am, but oh my God, toi have not seen how arrogant this girl is. She thinks she is soooo much better than everyone and refuses to associate herself with "average" riders. I won't fret if I lose to her, and I know I will, but it would be fantastic if a beginner (started riding in December) like me beat a self-proclaimed expert like her. And she is good. I know expecting to beat her in this millennia is unreal, but do toi have any tips that could help me? I do have one advantage: my horse knows plus than hers. Assuming I knew what I was doing, I could beat her in jumping, dressage, and Western dressage (as if she'd ride like a "hick" in Western), but I don't. I'm still in the licou, halter and walk/trot classes phase. Still, unrealistic ou not, I'd like to win, not only to beat her no matter how fun that'd be, but to well, win. Like I said, I'll have a blast even if I take last in everything, but how she irks me, I'd enjoy beating her. Ideas?