She defeated Alain Boire in the nomination race in the riding and went on to win the general election.
In the 2011 federal election, DeBellefeuille was a casualty of the Orange Wave, losing her seat to Anne Minh-Thu Quach of the New Democratic Party (NDP).
On June 17, 2020 DeBellefeuille spoke as party whip following New Democratic Party leader Jagmeet Singh calling fellow Bloc Québécois MP Alain Therrien a ‘racist’ after he (Therrien) voted against a motion to address systemic racism and discrimination in the RCMP.
On June 18, 2020 DeBellefeuille called for Singh to be blocked from speaking in Parliament due to the previous day’s ‘outburst’ but was unsuccessful.
[1] Since 2021 she has served as the Chief Whip in the Bloc Québécois Shadow Cabinet.