Eileen "Ellie" Creed is a character in the 1983 novel, Pet Sematary. She is the daughter of Louis Creed and Rachel Creed and the older sister of Gage Creed. In the novel and 1989 film adaptation, Ellie is the only survivor.
Pet Sematary 2
While not seen, Ellie is mentioned and was rumored to have gone insane, but nothing of this is ever confirmed to be true.
In the 2019 film adaptation, Ellie is the one who is killed and resurrected in the Pet Sematary instead of Gage.