Mike Rivet, her coach in Gloucester, convinced her to switch to long track, a decision in which she says, "I was ready to quit skating because I was just so discouraged and disappointed with it.

Blondin won her first major competitive medal when she placed second in the mass start event at the 2015 World Single Distance Championships.

After the race, she said, "I would have preferred the gold medal, but finishing first at this stage of my career remains a big accomplishment for me, so I'm super pumped with second place.

"[2] After results from the 2017–18 ISU Speed Skating World Cup, Blondin pre-qualified for the 2018 Winter Olympics in Pyeongchang, South Korea.

In 2020, she won the mass start event gold medal at the 2020 World Single Distances Speed Skating Championships at the Utah Olympic Oval in Salt Lake City, United States.

[14] Born in Ottawa, Ontario, Blondin attended École secondaire catholique Garneau, a catholic French high school; she completed a Veterinary Assistant program at Robertson College online and has a pet parrot named Gizmo and a St. Bernard-Pyrenees cross named Brooks.