Mary Wilson was on a Military Horse Riding course with the Royal Artillery, when she was thrown from her horse hitting a wall which fractured her right cheek and two toes. The accident also tore her bicep muscle off the bone on her right shoulder. In 2004 she was also diagnosed with Multiple Sclerosis. Wilson competed as part of the UK Armed Forces team, that took part in the US Warrior Games in 2013 in swimming. She will be representing the British Armed Forces in Athletics and Swimming.