The Time of the Ghost

Blurb

The Time of the Ghost is a supernatural English-language children's novel by Diana Wynne Jones, published by Macmillan in 1981. Set in the English countryside, it features a teenage ghost who is one of four sisters, and observes the family, unable to remember which one she is. She is from seven years in the future, in the aftermath of her "accident", so it is a kind of timeslip story, but she has no memories of those seven years.
Greenwillow Books published the first U.S. edition only in 1996. According to WorldCat, The Time of the Ghost is not among the twenty works by Jones that are most widely held in participating libraries.