Starlight, Star Bright by Janet Muirhead Hill
Approx. 37,310 words.
Published on March 31, 2010 by
Raven Publishing of Montana.
11-year-old Miranda Stevens secretly trains Starlight, the 3-year-old black stallion, whose wounds have healed. Miranda rides him and proves that he is the fastest horse Shady Hills Ranch has ever seen. But she must keep it secret. If his owner, Cash Taylor, finds out, he will never let Miranda buy him. When Starlight throws others who try to ride him, Miranda's hopes rise only to fall again.