[3] She is a member of Projet Montréal and has launched a campaign to succeed Valérie Plante as the party's candidate for mayor of Montreal in the 2025 municipal election.

[4] Lavigne Lalonde was born in the Montreal neighbourhood of Saint-Michel, part of the borough she currently represents.

[2] She studied psychology at the Université de Montréal, then international development and social project management at Sorbonne University in Paris.

[2] Before entering politics, she worked as a mental health responder and as a project manager for several international NGOs.

[4] Following her re-election in 2017, she joined Montreal's executive committee, where she was named responsible for the ecological transition and for urban agriculture.