Leblanc taught French and history and later worked as a researcher for television, as a freelance journalist for various magazines and as an advertising copywriter.
In 1980, she published a collection of humorous observations 'l'Homme objet; that was followed by a novel 37½ AA in 1983 which won the Prix Robert-Cliche.
In 1985, Leblanc wrote the script for the Radio-Canada television film Archimède.
She has continued to write for television, including the series Les Enquêtes de Chlorophylle and several episodes for the series Watatatow.
Leblanc has also published a number of short stories.