Jean Thompson (1933 - ) wrote several children’s books, of which one was a horse book.
Finding the book:very easy indeed to find in America; it was not published in the UK.
Links and sources
Many thanks to Lisa Catz for the photograph.
Bibliography - horse books only
Ghost Horse of the Palisades
William Morrow, New York, 1986, 101 pp, illus Steve Marchesi
Molly lives a quiet life on a ranch with her father, after her mother died a few years ago in a car crash. Molly has dreams. She wants her father to marry her teacher, Miss Miller, and she wants to be the one to tame Ghost, a wild stallion who steals her father’s best mare.