Authorities are looking for a missing Prescott Valley teenager who left Mingus Mountain Academy Thursday night. Yavapai County Sheriff’s officials are looking for 17-year-old Addisyn Shephard. Shephard was picked up from the school on East Don Carlos Drive at 8 p.m. in a black or dark-colored sedan. She is a white female, five-foot-three inches tall and weighs 140 pounds and has strawberry blonde hair and blue eyes. If anyone has information on her whereabouts, contact the Yavapai County Sheriff’s Office at (928) 771-3260 or call 911.