She served as a member of the National Assembly of Quebec from 1985 to 1997 sitting with the Liberal caucus in government and opposition.
Dionne easily held her seat in the 1989 Quebec general election winning well over half the popular vote.
She held her seat against Parti Québécois candidate Hélène Alarie by a margin of nearly 400 votes.
Dionne ran in a hotly contested five-way race in the electoral district of Kamouraska—Rivière-du-Loup—Temiscouata—Les Basques.
[1] Dionne is attempting a political come back, she ran for another term in provincial office under the Liberal banner in the Kamouraska-Témiscouata by-election of November 29, 2010 but lost to the Parti Québécois candidate André Simard.