By Alex Heigl / People
November 7, 2015

When Josie Kimberlin and her mother Alyssa Butler were going through the 4-year-old’s closet looking for a costume for her school’s “Superhero Day,” they discovered that her options were limited.

“She didn’t really have anything with any kind of superhero stuff on it,” Butler told the Huffington Post.

“So I asked her, ‘Do you just want to go as yourself? Because you know you’re mommy’s superhero,’ ” Butler said.

That’s because Josie was diagnosed with acute lymphoblastic leukemia in June 2013. (She went into remission about nine months after her diagnosis.)

So Josie decked herself out in a cape and costume that read: “Destroying cancer one day at a time,” and went off to Superhero Day.

Butler said she shared photos of Josie because she wanted to showcase the strength of kids everywhere fighting cancer.

“There are a lot of kids out there battling cancer and they are heroes,” she said.

This article originally appeared on People.com.

Contact us at editors@time.com.

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