(KRON) -- The Santa Cruz County Sheriff's Office is searching for a missing woman who was last seen Saturday. Her car was spotted on Tuesday in Redwood City, the sheriff's office said. Shelley Doughton, 67, lives in Scotts Valley -- a town just north of Santa Cruz. She left her home on Saturday at about 7:30 a.m. and was last seen then. Contra Costa County murderer attacked 2 prison guards: CDCR Doughton is believed to be driving a teal Chevy Silverado with the New Mexico license plate NSH360. Image from the Santa Cruz Sheriff's Office. The car was seen in Redwood City on Tuesday, but the sheriff's office does not know if she is still in that area. On Saturday, the car was in the Carmel/Monterey area. Doughton is 5-foot-4 with blue eyes and blonde/gray hair. Authorities are concerned due to her medical history. Anyone with information is asked to call (831) 471-1121.