Phoenix police have been looking for 11-year-old Emily since Wednesday when surveillance video shows the girl's mother walking her out of Phoenix Children's Hospital. Authorities say the girl underwent a month of chemotherapy and had been treated for an infection that forced doctors to amputate her arm.
Police say the girl is at risk of infection if she isn't brought back.
But the girl's father, Luis Bracamontes, tells NBC News she is safe and being treated in Mexico.
He blames the Phoenix hospital for the loss of his daughter's arm and says the family was pressured over medical bills.
Hospital officials say patient care is not based on ability to pay.