Hunkeler was in a car accident at age 22 which left her a paraplegic. She began wheelchair racing two years later.
At the 2004 Olympic Games, she finished 6th in the demonstration sport of Women's 800m wheelchair. She also participated in the 2004 Summer Paralympics, where she won a silver medal in both the 1500 metre and 5000 metre races. At the 2008 Paralympics, she took bronze in the 1500 metres and a gold in the marathon. She advanced to the finals of the 5000 metres, but crashed and caused a pile-up shortly before the end of the race. She suffered a broken collarbone in the accident and was disqualified from participating in the re-run of the race.