Definitely dont ignore her - That will make you look immature and childish and she will be glad she blew you off! Also dont go over to her!!!!! If you make eye contact throw a casual wave say hi and f there is distance between you just carry on being the life and soul of the group your talking too! If she approaches you be friendly DONT MENTION HER NOT REPLYING OR CALLING and act totally normal!
I suggest you go with one guy and 3 girls or a few girls so that when you turn up she sees you with chicks. Once inside the party remember be in control of frames within your group, lean back have it look to everyone like your surrounded by women, your interesting and funny. The key is to do it as if she is not there. DONT LOOK AT HER AT ALL whilst your doing this. If you happen to catch her eye (Which is a failure!!!!!! you should not be looking her way. Just give a friendly nod as you turn your attention back to the group) Dont laugh loud so she can hear your a try hard....remain natural as if you were not doing any of the stuff you actually are. Then this girl if you do it right will almost feel like you never went out at all or you do that kind of thing so often that you forgot about it!
Then once she starts trying to get your attention be friendly and fun but make her work for your time! Remember dont trade status for approval!
......then nail the evil little minx
Just kidding!