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Queen Rider by Alan Davidson, a tween/YA equestrian school drama novel originally out from W. H. Allen/Methuen in 1979.
Impossible Bonnie Wyndham, expelled from her last three schools, knows she's only been accepted at sports-mad Almonside because she's a superb rider. She doesn't intend to stay long. Just long enough to prove she's the best. But equally Ruth Caradon, her tough, soft-spoken riding instructor, doesn't intend to let Bonnie get the better of her and queen it around Almonside. Or -- is their conflict about something different altogether?
A riveting study of a power struggle, with a nail-biting show jumping background, from the author of The Bewitching of Alison Allbright.