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SPANAWAY, Wash. – A mother mourning the loss of her daughter shared a heartbreaking image of her daughter’s urn buckled in to the backseat of her car just months after the girl died of cancer.

Sarah Walton’s youngest daughter, Ellie, was diagnosed with a rare brain tumor when she was just 4 months old. The family has been in-and-out of the hospital ever since.

Two months ago, Ellie died from cancer. Walton recently went to a funeral home to pick up her daughter’s ashes. She posted a photo to the Prayers for Ellie Walton Facebook page, showing Ellie’s temporary urn bucked up in Ellie’s car seat.

“It was very muscle memory,” Walton of Washington State told Inside Edition. “It was just natural for me to do that. It was a safe place for her to be.”

The photo captured the urn, decorated with a photo of Ellie, strapped into the car seat. Next to the urn were Ellie’s flowery sunglasses.

“I’m thankful that I made sure to tell you every single day just how much I loved you. I will forever be grateful to have been your mommy,” Walton wrote in the Facebook post.

Walton says she will continue to raise awareness about pediatric cancer and do what she can to raise money to fins a cure of the disease.

“I never want another mom to feel this way, and I will fight for these other kids so that no other mom has to buckle in ashes of their babies,” wrote Walton.