[1][2] She made her World Cup debut in November 2015 in slalom at Aspen, and was 27th.

[3] She scored her first World Cup points in November 2017 at Levi with a 17th-place finish in the slalom.

St-Germain raced collegiately in the United States for the Catamounts of the University of Vermont, just over the border in Burlington; she was a three-time All-American and the national runner-up in the slalom in 2016.

[8][9] At the 2023 World Championships in Méribel, St-Germain won the gold medal in the slalom.

[10] She was the first Canadian woman in 63 years to win an alpine skiing slalom world championship.