She's described as a Hispanic woman who is 5 feet 6 inches tall and weighs 160 pounds. She has a dark complexion and dark hair that was worn in a low bun.
The suspect was also wearing a dark, fitted jacket and dark pants.
The baby was found unharmed inside the stolen Jeep on Monday, five hours after she was taken and a statewide Amber Alert was issued.
Investigators are processing evidence and asking anyone with information to contact San Jose police.