Authorities say Madeline Samaan-Fay was taken by her father, 49-year-old Mourad "Moni" Samaan, on Sunday and may be in danger.
The girl was described as about 2 feet, 8 inches tall, 28 pounds, with brown hair and brown eyes. Her father is about 5 feet, 6 inches tall and weighs about 160 pounds, with black hair and brown eyes.
Samaan may be driving a green Toyota 4Runner with California license 3XRM111.
Anyone with information was urged to call 911.