Meet Ella and Olivia.Big sister. Little sister. Best friends.Ella and Olivia are sisters. Ella is seven years old. Olivia is five-and-a-half years old. They live with their mum and dad and little brother Max.Ella's friend Zoe is entering an equestrian competition. She invites Ella along to help her groom her horse, Hattie. But Ella has other plans! She ends up entering the pony competition - by accident!