[3] Tina and Jaimey jointly operate Stoney Lake Equestrian, a horse training and breeding stable in Whitchurch-Stouffville, Ontario, which serves as their homebase.

[6] In August 2011, Irwin, Thomas Dvorak, Crystal Kroetch, and Roberta Byng-Morris were announced to be the members competing for Canada in team dressage at the 2011 Pan American Games in Guadalajara, Mexico.

On March 15, she and Fancy That achieved a first-place finish in Freestyle at the Adequan Global Dressage Festival (AGDF) in Wellington, Florida, with a score of 74.375%.

[2] On May 19, Irwin competed in Grand Prix freestyle at the Ottawa Dressage Festival, where she won silver with a score of 67.700%, 2.75 percentage points behind Jill Irving.

[12] In 2019, Irwin returned to small tour competition, as opposed to Grand Prix, in attempt to qualify for the 2019 Pan American Games.

[13] Prior to the AGDF in Wellington on February 20, 2019, Irwin injured her left hand as a result of a kick by a horse.

[15] On March 5, 2019, Equestrian Canada announced that Irwin would be on the Canadian dressage team competing at the AGDF, along with Jill Irving, Lindsay Kellock, and Belinda Trussell.

Their performance qualified Canada for the team dressage event at the 2020 Summer Olympics in Tokyo, Japan.