When did Samantha start wheelchair racing?

According to the text, Samantha started wheelchair racing after a physiotherapist at the hospital took her to Stoke Mandeville, the national centre for disability sports, and she tried different wheelchair sports. She realized she was very good at wheelchair racing. The text does not explicitly mention a specific date, but it does mention that she started training six times a week and won the Great Scottish Run 10-kilometer wheelchair race in September 2012.