Nixon began curling competitively at fourteen. Her first notable success was being a Gold Medal winning skip at the Saskatchewan Winter Games in 1994. As a third for Shannon Kleibrink, Nixon shared in several successes, including winning the Canada Cup in 2005 and 2009 and representing Canada and won a bronze medal in Turin for the 2006 Winter Olympic Games. Nixon captured her first Scotties Tournament of Hearts title in 2012 as an alternate for the Heather Nedohin team after previous appearances in 2004, 2008, and 2010 with Kleibrink.
At the end of the 2011/2012 curling season, Nixon announced she would leave her longtime teammate and skip Shannon Kleibrink, effective at the end of the 2012 Pomeroy Inn & Suites Prairie Showdown, to form her own team. Nixon's father, Daryl, was the coach of the 2006 Olympic women's curling team.