Bristal Brewster's parents assumed she had hurt herself in dance class before learning the truth, which "was really hard to process," her mom Brianna saysBristal BrewsterCredit: Courtesy of Brianna Brewster (2)NEED TO KNOWA family from Idaho noticed their daughter, Bristal, was limping, and assumed she had hurt herself in dance classAfter her parents took Bristal to the hospital, an MRI scan revealed the heartbreaking reason for the changeThe lo…