She won the world junior road and time trial championships in 1999 and the Tour de Snowy in 2000.

She acknowledged in a documentary on Radio-Canada (the French-language CBC) on September 20, 2007, that she had been administered EPO more or less continuously since she was 16 years old.

[1] After residing in Phoenix, Arizona and San Diego, California (where she studied sociology and psychology), Jeanson came back to Lachine, Quebec in 2012 to live with her once estranged parents and complete her college-level education at the Saint-Anne Collégial International.

In early June, she won the Montreal World Cup, lapping most of the field and winning by more than seven minutes.

In late 2003, while with the national team preparing for the world championships in Hamilton, Ontario, Jeanson had a hematocrit level (a measure of red cells in the blood) above the limit and was not allowed to race for two weeks.

On November 28, 2006, the United States Anti-Doping Agency said she had accepted a two-year suspension from 25 July 2005, the day her sample was taken.

[1] Her coach André Aubut and doctor Maurice Duquette were banned for life by the Canadian Center for Ethics in Sport in 2009.