Criddle first competed at the Paralympics at the 2000 Games held in Sydney, where she finished eighth in the individual grade III event and fourth in the freestyle grade III. She won individual, freestyle and team gold medals at both the 2001 European Championships and the 2003 World Championships. At the 2004 Summer Paralympics in Athens, Greece, she won three gold medals. Riding the Nina Venables owned horse Figaro IX she won the individual and freestyle grade III events and was a part of Great Britain's victorious squad in the team championship. This made her and Figaro the first horse and rider combination to have won triple gold at consecutive European, World and Paralympic Games. At the 2008 Summer Paralympics in Beijing, China, she was selected to compete as an individual rider and she finished fifth in the individual and fourth in the freestyle.