Daphne Rooke was born in Transvaal, South Africa, 6th March 1914, and moved to Australia in 1946. Her mother, Marie Knevitt, was a writer, as was her uncle, and she worked as a journalist in South Africa. In 1937, she married an Australian, Irvin Rooke, and moved to Australia. When he died in the 1980s, she moved to England, where her daughter lived. Daphne Rooke has written both adult and children’s novels. As far as I know, the only horse-related one is A Horse of His Own. It is reasonably easy to find.