Jill Rides Cross-Country

This is the first book in the Jill Series by Jemma Spark.
Jill Crewe has lived in a perfect world of ponies and gymkhanas in a small English village, Chatton. Discouraged from a career with horses, she is about to reluctantly go off to secretarial college when her life is turned upside down. Her mother announces that she is getting married again and they are going to live in a Scottish Highland castle, with hundreds of acres of moorland, stables, an indoor riding school and a cross-country course. Jill feels that she has to prove her worth as a person, not only to herself, but also to her new-found relations, as she prepares to enter adult equestrian competitions.