I see it's been a while since anyone posted to this thread. But if you are still looking for a movie with a group of girls working together, try Bend It Like Beckham. It's a British film about two teen girls who play soccer, and how they handle their families support for their sport(or lack.) One girl is British,the other British-(Asian)Indian. The film is very funny and very engaging, the acting is great, the characters are very realistic.
I think it was rated PG-13, and I would not show it to younger girls, as there are some more mature themes - cultural clashes, deceiving parents,