This is likely a photo of Francina Cameron, wife of William Edward Turner. In the Musée du Bas-Saint-Laurent cyberphotos archive, the photo is catalogued as "M. W. Turner" of Rivière-du-Loup. In all photos of females; the "M" stands for Mille or Madame. As far as is known, the only W. Turner in Rivière-du-Loup at the time was William Edward.