Olivia Ostergard was last seen between 47th Avenue and Lincoln Way, her mother, Jennifer Ostergard, said Sunday night.
Ostergard is 5 feet tall. She weighs 80 pounds and has light brown curly hair. She was wearing a brown puffy jacket, T-shirt, blue jeans and white tennis shoes, her mother said.
Ostergard is asking anyone who may have seen her daughter to call San Francisco police at (415) 666-8900.