[1] Grand'Maison developed a condition that degrades the vision of the eyes called macular degeneration at the age of 12.

In 2006 at the National Swimming Paralympic Championships in South Africa, she won seven medals with five of them being gold.

In 2011, at the Pan-Pacific Championships in Edmonton, Grand'Maison raced the 200 m individual medley and won the gold medal.

[7] At the 2012 Summer Paralympics in London, Grand'Maison participated in the 50 m and 100 m freestyle, 100 m breakstroke and 200 m individual medley events.

[9][10][11] Grand'Maison's final international competition was the 2013 IPC Swimming World Championships held in her hometown of Montreal, Canada.