I dont like the snobby new girl...?

I'm on a soccer team and on at practice on Monday we got a new girl. I didn't like her the moment I saw her. Everyone on the team had to pay a few grand to get on but SHE didn't have to pay a thing! Shes my coaches friends daughter, and a pill. We've already played 5 games and have a tournament coming up that we(not her my former team) have been practing extra long for. So ya this girl is a complete brat to everyone on the team. But when the coaches are around(I have 4 coaches) shes all like an angel. She is actually good tho. But we dont even need her on our team. Our team was, i repeat was always happy and played wonderfully together and we were really a "team" until she came along and plays MY position. She never pes. Shes playing everyones possition and gets to be the hero, always winning awards that I used to get. How do I tell this chick to back off?!