In 2006 while working at a paint factory she was struck by a 5-tonne steel frame. Her right lower leg was amputated below the knee. After finding the transition back to tennis difficult she was encouraged to switch to track and field and quickly found success, setting Japanese records in the F44 category for the 100 and 200 meter events shortly after.
Nakanishi competed in the 2008 Summer Paralympics in Beijing, China, where she placed 4th in the women's 200 m F44 event, and finished sixth in the women's 100 metres.
Due to lack of funds, Nakanishi was unable to participate in the 2011 IPC Athletics World Championships in Christchurch, New Zealand. Japanese government support for Paralympic athletes is limited, and while training for the London Olympics in 2012 she found it difficult to raise enough funds to compete and to purchase a new prosthetic leg.
On 7 September 2014, Nakanishi won the T44 long jump at the Japan Para Championships, setting a personal record at 5.33 m. The International Paralympic Committee recognized this as a Japanese record.
