Alright mate... you have quite a few options... one is to spend time in your bedroom learning a dance move for you to pop out that will be amusing (some of my friends do a running man with a sexy twist/ jackson moves etc.) you could potentially even burst into the middle and do it for max risk:max reward...
One funny option that i use frequently is to slut drop the girl hahaha but when you do it don't even look at her afterwards... some ignore it, but some even go as far to turn around and say "have you just slut dropped me :S"... its funny, especially when all your mates laugh and she might even feel the butt of the joke, lowering her self-esteem just for you

... jokes i would obvs not suggest lowering her self-esteem
another thing to think about... at some point, they are going to need to go to the bar... bar openers... just be aware that you need to interact, and have the approval of at least most of the group... unless she is quite isolated...
if you want to be a dick... dance crazily behind them, accidentally "spill" some drink on one of them... then apologise and ask if she would like to come the bar with you... if she fucking tells you to go the bar for her, then leave her, the worst thing that can happen is she comes looking for you and self-isolates herself