her parents took her to md anderson cancer center. the doctor recommended a new kind of radiation called proton therapy. because it pinpoints the tumor so precisely, there's less damage to nearby healthy cells. >> she's a really smart kid, and i was able to really discuss therapy and radiation therapy and how we deliver it. i explained that proton therapy goes into the patient and then it stops, unlike x-ray therapy, which goes into the patient and goes out the other side. >> traditional radiation, or the newer proton therapy -- the choice was hailey's to make. like a school project, she spent time doing research. >> there was no question in her mind. she did not want to live with the seizures. she did not want to be over-medicated. she switched her research from regular, traditional radiation to the proton therapy, and with what she read, she felt more comfortable with it. >> hailey also decided to continue training, even through the treatment. >> i chose to continue training because when i'm here, i feel like i'm at home. and so, i