Stupendously Samson: Princess Auroras Horse (Disneys Horsetail Hollow, Book 4)

"Ever since Maddie and her sister, Evie, moved with their family from the big city to a farm called Horsetail Hollow, it's been one magical adventure after another. A mixed-up wish has been bringing horses from fairy tale worlds to their farm--and the sisters are the only ones who can help them save their happily-ever-afters!"--