Valencort,(Valencourt) Mayla born 1861 Toronto/Montreal

My Great Grandmother Mayla Valencort was born in Toronto in 1861. Her father William was a fur trapper & I think he was maybe born in France. Family history hints that he married a Canadian Indian & had several(8) children one was my GGGrandmother. She was of the Catholic religion & she knew several Religious Nuns in Montreal very well. Mayla traveled to New York looking for work at age 18. Does anyone have any information about a Catholic church/school that may have been in existence in Montreal in 1860-1915? Thank you