According to the novel, Helen was a member of The Ultras. She bullied Carrie during the locker room incident by making throw-up gestures at her. She was also the best friend of Sue Snell and the girlfriend of Roy Evarts. It is unclear, if Helen escaped or not. However, her mother, Georgette Shyres, dies and there's no mention of Helen surviving, which implies she must have died, too..