The woman’s husband ran to a neighbour’s home call for help shortly after midnight.
His 81-year-old wife, who had physical disabilities, couldn’t make it outside.
Firefighters responded to the call on Val-des-Lacs Road in Sainte-Agathe-des-Monts.
The woman was declared dead in hospital.
Officers were investigating on Tuesday morning to try to figure out exactly what happened.
The cause of the fire is unknown.