She was awarded a scholarship with the Australian Institute of Sport (AIS) and was voted 16–19 years female Triathlete of the Year 2000. Despite this she wasnot selected for the Australian team for the 2004 Athens Olympics. In 2005, Snowsill took her second world crown in Gamagori, Japan, in 35 °C (95 °F) temperatures and 90% relative humidity.
Snowsill skipped the International Telecommunication Union World Championships in order to devote all of energy to the 2008 Beijing Olympics.
During the triathlon event she stayed with the leaders in the swim and cycle legs and broke clear in the run. Snowsill missed out on selection for the Australian London 2012 Olympic Triathlon Team.
She appealed her omission but was turned down by the Tribunal. Snowsill decided not to take her case to the Court of Arbitration for Sport saying "Whilst I am upset with the outcome, I have to respect the decision of the Tribunal and will not be pursuing the matter further." In a gracious response Snowsill went on to wish the three selected women (Emma Moffatt, Erin Densham and Emma Jackson) good luck for their race in London.
Snowsill has one sister, Amy, who works as a lawyer in Sydney.