How do you uninvite a girl to a gathering?

So I’ll attempt to make this as sweet and simple as possible. So background info: there’s this girl that half of our friend group despises. Unfortunately, she is basically invited to things out of sorrow and trying to avoid her getting upset at us if she isn’t invited. As you may tell, I am one of those who are not quite fond of her for she is rude, stubborn and she’s a party pooper. On facebook, we always have message threads amongst our friend group and of course, she gets the messages. So this girl invited us to watch Harry Potter 7 part 2 at midnight along with a sleepover afterwards, and of course this girl got the invite and she accepted it. The thing is, yes everyone in our group does not want her there. Initially she was fun to hang out with when we were young but now that we are in high school I felt that we have grown apart and changed and our personalities just don’t clash. I was in a class with her throughout the first years of highschool and we legitamately spoke once. How can I consult the girl who inevitably invited us all to the movies to uninvite her? I know this seems a bit harsh but it is vital to our friends. She has done unspeakable things to our reputation.