Meg Worrell-Hart, 21, said she was "sore and shaken up" after being hit by a car that was going "too fast".
Frenchman Julien Epaillard beats Britain's Scott Brash to win the World Cup show jumping title at the Olympia Horse Show.
Patrik Kittel and Delaunay OLD win the dressage freestyle at the Olympia Horse Show, with Britain's Emile Faurie second on Delatio.
Watch live coverage of the 2017 Olympia Horse Show across BBC Two, BBC Red Button, the BBC Sport website and mobile app.
Audio & Video
The Arabian horse crossing checkpoints to compete in a show bringing Israelis and Palestinians together.
Live sport online coverage from the BBC
Check out the BBC Sport Live Guide for details of all the forthcoming live sport on the BBC.
How to get into Equestrian sports
How to get into horse racing, whether you want to work with horses at the stables, become a racing jockey or take part in the Olympics.