Authorities are seeking help finding a missing 13-year-old girl from Garryowen, Sawade Birdinground.Birdinground is 5 feet 4 inches tall, weighs 130 pounds and has brown eyes and curly brown hair.She was last sen at 11 p.m. Sunday, Oct. 6, at her home wearing a black hoodie, an anime T-shirt and purple shoes.Her family could not find her when they went to wake her Monday morning, according to authorities.Her family is worried because she has mental-health issues, and the weather is getting colder. Call the Big Horn County Sheriff's Office at 406 665-9780 or 911 with information on her whereabouts.A Missing Endangered Person Advisory was issued on behalf of the Crow BIA and the Big Horn County Sheriff's Office.