Sinclair won a gold medal at the 2007 Canada Winter Games, playing lead for the Rachel Homan rink. She was a member of the Homan rink that won the 2006 Bantam provincial championship. She won the Bantam provincial championship again in 2009 as a skip.
Sinclair played in her first World Curling Tour (WCT) event, at the 2011 Challenge Casino Lac Leamy. Her rink finished with a 1–2 record in her pool, and did not make the playoffs.
Sinclair and her rink of Holly Donaldson, Chantal Allan and Casandra Raganold won the provincial women's junior championship in 2012, defeating Lauren Horton 9-3. This earned her rink the right to represent Ontario at the 2012 Canadian Junior Curling Championships where they finished with a 7–5 record, just missing the playoffs in 4th place.
Sinclair won her second straight provincial junior title in 2013, with a new front end of Katelyn Wasylkiw and Erin Jenkins with Donaldson still at third. At the 2013 Canadian Junior Curling Championships, her team did make the playoffs, but lost in the semi-final to Manitoba's Shannon Birchard, settling for third place.
For the 2013-14 season, Sinclair played on WCT teams on both sides of the border, playing third for the Ottawa-based Brit O'Neill rink, and third for the St. Paul, Minnesota-based Alexandra Carlson rink. With the Carlson rink, Sinclair played in the 2014 United States Women's Curling Championship, finishing with a 6-3 round robin record, but losing in a tie-breaker match. At the end of the season, Sinclair won the 2014 CIS/CCA Curling Championships, Canada's national university championship for Carleton University.
In 2014, Sinclair fully committed to playing out of the United States, and would move to Minnesota. For the 2014-15 season, she played third for the Nina Roth rink, which also consisted of Becca Hamilton and Tabitha Peterson. The team missed the playoffs at the 2015 United States Women's Curling Championship. The team played in two Grand Slam events, missing the playoffs at both the 2014 Colonial Square Ladies Classic and the 2014 Canadian Open of Curling.
In 2015, Roth left the team, with Sinclair assuming skipping duties, Hamilton throwing third rocks, Tabitha Peterson staying at lead and Tara Peterson joining the team at second. In their first season together, the team finished 4th at the 2016 United States Women's Curling Championship. The team played in one Slam, the 2015 National, going winless.
In 2016, Sinclair formed a new team with Alexandra Carlson, Vicky Persinger and Monica Walker. Sinclair found much more success with her new team, winning the 2017 U.S. Championships, but missed out on going to the World Championship due to not having enough points on the World Curling Tour. She did play for the winning North American Team at the 2017 Continental Cup of Curling. The team played in one Grand Slam, the 2017 Humpty's Champions Cup (qualifying as US champions). The team would make it all the way to the quarterfinals.
The team started the 2017-18 season by winning the AMJ Campbell Shorty Jenkins Classic.
Sinclair was born in Anchorage, Alaska, where her father was on military exchange.
In October 2016 it was announced that she would appear as "Miss July" in the 2017 Women of Curling calendar.