Whip It (2009) on Netflix

In a town near Austin, Bliss Cavendar's strong-willed mom believes Bliss, at 17, can win pageants - the key to a happy life. Bliss isn't the beauty pageant type: she's shy, quiet, and has just one friend, Pash, her fellow waitress at a diner. Things change for Bliss when she discovers a women's roller derby league in Austin, tries out, proves to be whip fast, and makes a team. Now she needs to become someone tough on the rink, keep her parents from finding out where she goes twice a week, and do something about a first crush, on a musician she meets at the derby. Meanwhile, mom still sees Bliss as Miss Bluebonnet. Things are on a collision course; will everyone get banged up?