Kaia Fina was found Monday by U.S. Marshals and sheriff's deputies in Beverly Beach, Oregon with her biological mother, Sera Fina, who does not have custody of her daughter.
The girl had been living in a San Clemente foster home after her mother lost custody of her. She was previously last seen Sept. 6.
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Kaia has been returned to Social Services, authorities said.
Sera Fina was taken into custody for child abduction.