Elliot, Ginny

Ginny Elliot, MBE, born February 2, 1955 (Virginia Holgate) is best known for her stellar eventing career, which saw her win two European championships, and four Olympic medals (two silver and two bronze). She has written (or co-written) several books about her equine career and her horses, as well as these pony books. Ginny Elliot is now coach for the Irish Eventing Team.

Her three books about Becky are, as far as I know, the only pony books she has written.  

Finding the books
All her titles are easy to find.