Kaylee Rider and her mom Rachel have an appointment at the hospital every Tuesday.
Kaylee has Wilm's Tumor. It's a kidney cancer that has progressed into her lungs.
Now that she's battling cancer for the second time, this seven-year-old has endured more than most adults can even imagine.
But there's one part of her fight really bothers her.
"We had to tell her it came back, the first thing she asked was if she was going to lose her hair, and I didn't want to lose my hair," she said.
Unfortunately, it didn't work out like she was hoping. So to send a positive message to little girls just like Kaylee, a new online movement is pushing Mattel to come out with a Cancer Barbie .
If Mattel agrees to make the bald Barbie, the people behind the campaign hope the company will donate at least some of the proceeds to Saint Jude's Children's Hospital.