Vision Montreal won a majority government in this election under Pierre Bourque's leadership, and St-Arnaud served as a supporter of the administration.
She was appointed as an assistant to Montreal executive committee chairman Noushig Eloyan and was given responsibility for community groups and for sports and recreation.
[2] In 1996, she took part in difficult negotiations with municipal day camps and oversaw fee increases for children's hockey, baseball, and soccer.
[5] In 1998, she rejected a proposal by fellow Montreal councillor Marvin Rotrand for public consultation in the selection of the urban community's next chief.
In March 2000, she argued that repressive approaches such as arrests and prosecutions had not been successful and announced a pilot project in two districts aimed at getting prostitutes off the streets through social work.
[13] St-Arnaud joined Tremblay's party, by now renamed as Union Montreal, in June 2009 and ran under its banner for borough mayor of Mercier–Hochelaga-Maisonneuve in the 2009 municipal election.