Leroux was born in Quebec in 1979 and she took philosophy as her degree. She was the Toronto correspondent of Radio Canada. She is a shortlisted nominee for the 2016 Scotiabank Giller Prize for The Party Wall, a translation by Lazer Lederhendler of her 2013 novel Le mur mitoyen.
Leroux's first novel, La marche en forêt, was published in 2011 and was a finalist for the 2012 Prix des libraires du Québec. Le mur mitoyen followed in 2013, and was a finalist for the 2013 Grand prix du livre de Montréal and won the Prix littéraire France-Québec in 2014.
She published the short story collection Madame Victoria in 2015. The book won the Prix Adrienne-Choquette in 2016.