She has been married since 1993 to former Australian professional triathlete Greg Welch.
[1] In 1994, she won the Escape from Alcatraz Triathlon in San Francisco.
In 2000, she ended her pro career—three months after her husband Greg announced his retirement.
[2] In October 1997, she and her compatriot Wendy Ingraham delivered a thrilling duel for fourth place on the final stretch of the Ironman Hawaii, as the two were dehydrated and exhausted overturned and could only crawl to the finish on all fours.
[6] The 50-year-old Sian started after more than 10 years break from racing in April at Ironman 70.3 in Liuzhou, China and was qualified as the winner of their age group again for a starting place at Ironman Hawaii in October.