Georgia Rule (2007) on Netflix

Rachel comes to stay with her Grandmother Georgia for the summer leaving some obvious problems behind at home. Her alcoholic mother doesn't even stay the night before rushing back out to California to be with her husband. Rachel shakes up the town, a beautiful girl in the boring Mormon country. Then she reveals her deepest secret to one of her new friends, and her mother comes rushing back to find out if its true. In the midst of this crisis the three woman become closer than ever and start to understand each other more.