Tatiana Isabel Sanchez-Dubeau has spoken to her mother since she was last seen on May 2, 2014, police said, but did not tell her family where she was.
Police say there is reason to believe she may be in western Canada.
Sanchez-Dubeau is five-foot-one with pale skin and brown hair. She speaks both French and English.
Anyone with information is asked to call 450-662-4636.