in fact, as jacelyn reports, thanks to breakthrough medical treatments, she's barely even slowing down. >> hailey makes walking on her hands look easy. yes, her teammates can do it, too, but consider this -- just in the past four years, hailey has had surgery for a brain tumor and multiple radiation treatments. >> get on top fast. swing up. she's like a bulldozer. she plows through whatever comes at her. no matter what, she kept pushing through and trying to do workouts to try to stay up with the group. >> talk about being able to bounce back. this texas teen has earned a spot on one of the top squads in the state. >> i've been doing gymnastics since i was 5. >> she also had been having headaches since she was 5, but it wasn't until she was 11 that doctors discovered the reason -- a tumor in her brain. and that meant surgery. >> i wasn't scared or nervous. i mean, they didn't really tell gonna have brain surgery," so, i mean, it was not a big deal to me. >> we didn't really even tell her the severity of what was going on because she was so young. >> the biggest question on hailey's min