Christina Hammond, 34, left the Female Community Reentry Program just before 9 p.m. Sunday night, according to the California Department of Corrections and Rehabilitation.
Authorities say surveillance footage showed her leaving through a side door before climbing over a gate.
Her ankle monitor was found near her bed.
Hammond was last seen wearing a gray jacket, gray sweatpants, gloves and carrying a blue bag.
She was serving a five-year sentence for an assault conviction and was set to be released in Dec. 2025.