Dorothy Hardy “doesn’t walk, she dances,” says her mom, Carrie. “She just waltzes around the house, singing songs she makes up. She’s not to be stopped.” In fact, when the little girl injured her leg at the playground, she taught herself to dance while wearing a cast. It’s a resilient, determined attitude that Dorothy — now two-and-a-half years old — has had since she was diagnosed with jejunal atresia as a newborn. …