How do i kick her out of the group?

[totaldramahookah]

So my friend Reth recently found a girl named Molly who moved in from California a couple of months ago. Molly is a teen mom so I can already tell that she's not into the things that we are into. She came to a gala that Dobby, our circle leader was throwing; and she degraded all of us by showing up in a see through black shirt. She's really assuming and all my other friends seem to like her, and I really can't stand her and think that she's a slut. She's always slighting me and declined my facebook request. I am not talking to Reth so i am begging to think that she is trying to replace her with me; and she convinced Anna to invite her to her cousins' bar mitzvah. How do i give her the slip?