There was a show on Disney channel or Disney XD around 2009.
I think it was an anime styled and futuristic. this girl raced what seemed to be space ships and had many friends.
I'm not sure if she had a troubled past or not.
Per Krazer's answer, the only Disney channel show that seems to fit the bill is Ōban Star-Racers.
Notably, the show is in an anime style, the primary character (Molly) has red hair and there are many races seen. She also has an extensive fan-base and several friends.
The description on Wikipedia closely mirrors your own: