She sounds very sensitive and has possible issues with coping with emotion and her environment. Have you tried teaching her coping mechanisms or alternative behaviors? For example, when she loses a game, you could role play what she CAN do or what she can't do. When she is upset, give her self soothing or calming strategies. (this includes deep breaths, counting to 10, opening and closing her fists, giving herself a hug, going to a cool down spot that no one an bother her in). Is she a picky eater? Have you ever looked into sensory integration disorder?