There is an Ann Gravel listed in the 1881 census for Essa, Simcoe South,ON, that was widowed, living with a Robert McQuirters, age 2, which means that her husband died prior to 1881.
Living with her daughter’s family in Bethune, Muskoka & Parry Sound district in 1901 census. She is listed being of Scotch descent, but born in Ontario.