Cheryl Bau-Tremblay returned to her home in Beloeil Saturday after several days in the Eastern Townships, police said.
A short time later, she left her home on foot and never returned.
Bau-Tremblay is described as five-feet-two-inches tall, about 140 lbs with black hair and blue eyes. She speaks French and has a tattoo on her wrist.
She was wearing black clothing when she left home.
Anyone with information is asked to call Info Crime at 450-922-7001 ext. 399.