. >> reporter: as a toddler, amanda seemed to be healthy and rriving. >> she was a typical two-year-d having fun with her sisters. >> reporter: but a routine x-ray c a bump on her leg revealed she had an often-lethal form of sncer, ewing's sarcoma. she had 14 rounds of chemotherapy before her third birthday. >> every morning, the first thing i would do was check to see if she was still alive. >> reporter: doctors amputated her leg at the knee. amanda was so young, she doesn't remember. a i don't really think, "i would do better if i had two legs." i just have this and i try to do the best i can. >> reporter: because her leg doesn't bend at the knee, she had to change the way she shoots and runs. >> when i shoot, like, people normally bend both their knees. for me, i just kind of, like, step out, and, like, shoot. for running, since i can't really bend my leg, i kind of swing it to the side. but for basketball, i'm normally the first one down the court, 'm, i mean... >> reporter: her parents say that's been her attitude since she was little. >> she always wanted to climb up the slide,