Who is Gloria Hilton from Welcome to the Monkey House and what is their importance?

Gloria is an aging Hollywood actress who has been married 5 times. She is vain. She asks that her likeness be sand-blasted onto her new shower doors. She is full of emotion and convinced that her current husband, George, is not nearly as in touch with his emotions. She accuses him of not being able to love. Gloria is melodramatic in their fight, which the narrator overhears. She impulsively ends her marriage to George, then drives out of town ten minutes later.