A 15-year-old California girl has been missing for nearly two weeks after disappearing on a layover at Denver International Airport.

Harper Cadman arrived in Denver aboard a United Airlines flight from Montana at about 8:30 a.m. on January 30, but she never boarded her flight home to California, KDVR reported.

The National Center for Missing and Exploited Children said it’s possible that she traveled to the Boulder area.

She is described as 5 feet 7 inches tall and 115 pounds. She has blue eyes, dyed black hair, braces, a nose piercing, and tattoos on her waist and the middle finger of her left hand.

Cadman’s mother, Ari Petronelli, wrote on Facebook that her daughter had been in Montana for mental health treatment and was returning to California. She said it was the second time in a year that Cadman had vanished.

“I am sick to my stomach writing this and I never thought that I would ever have to post another missing flier of my own child but if anything this last year has taught me is that life just doesn’t make sense,” she wrote.

Petronelli said that she and her sister spent a week in Colorado talking with detectives and searching.

“Leaving Colorado without her felt as though I was abandoning my baby girl and ripped my heart in a million pieces not knowing if she is warm, safe, or has food in her stomach,” she said.

Petronelli said Cadman’s luggage made it back to California and that her daughter doesn’t know anyone in Colorado.

Anyone with information is asked to contact NCMEC at 1-800-THE-LOST (1-800-843-5678) or the Denver Police Department at 1-720-913-2000.

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[Featured image: Harper Cadman/National Center for Missing and Exploited Children]