Investigators served a court order at a Phoenix home Wednesday and found the girl being hidden in a bathroom shower.
Investigators said she was scared but in good physical condition.
Authorities said the girl's name and birth date was changed and she did not attend school. She was living with people that were not her family.
The girl was positively identified using footprints, photographs and DNA.
She was flown back to California. It is not clear where she will be staying while in California.