Jones started competing in triathlons in 1990. In 1992 and 1993 she won the ITU Triathlon World Championships. In 1996, she won the inaugural XTERRA Triathlon World Championships. Jones would go on to further expand her triathlon résumé by winning the ITU Triathlon World Cup in 1998 and 1999. At the 2000 Summer Olympics Jones took the silver medal in the inaugural triathlon event with a total time of 2:00:42.55, only two seconds behind gold medalist Brigitte McMahon. Her split times were 19:43.88 for the swim, 1:05:32.90 for the cycling and 0:35:25.77 for the run.