a ballerina, repeatedly engages in self-induced vomiting and exhibits an intense fear of gaining weight. After 6 hours of dancing, she jogs for a half hour to ensure she does not gain weight. She eats only salad and avoids any breads or meat because of the calories. She claims she feels fat compared to other dancers and is highly concerned with her body's shape. However, she is 5'5" and weighs 100 pounds. According to DSM-5 she would most likely receive what diagnosis?