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.

[6] 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 fourth 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.

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.

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.

[11] Representing the United States at the 2018 World Women's Championship, they finished fourth, losing the bronze medal game to Russia's Victoria Moiseeva.

At the 2020 United States Women's Championship Team Sinclair only lost one game in the round robin, earning the number one seed in the playoffs.

[17] In March 2020, after an early end to the curling season due to the COVID-19 pandemic, Sinclair announced via twitter that her teammates had decided to part ways with her.

[18][19] Later in the off-season it was announced that Sinclair had formed a new team, bringing Walker out of her short retirement to play at third, and adding two younger curlers for the front end, Cora Farrell and Elizabeth Cousins.

[20][21] The team was not able to compete in any tour events due to the pandemic, but they were able to play in the 2021 United States Women's Curling Championship, held May 26–30 in Wausau, Wisconsin.

[22] There, they topped the round robin with an undefeated 6–0 record, which qualified them directly to the championship final where they faced Team Cory Christensen, Sinclair's former teammates.

[27] Team Sinclair then played in the 2021 United States Olympic Curling Trials, held November 12 to 21 at the Baxter Arena in Omaha, Nebraska.

[31] The team also played in the 2022 United States Mixed Doubles Curling Championship later in the season where they lost in the semifinal to Sinclair's teammate Monica Walker and Andrew Stopera, earning the bronze medal.

Due to recent participation in the US playdown process, it was originally announced that she would not be eligible to play in the Scotties Tournament of Hearts (Canadian Nationals) until the 2024–25 season.