From ancestry, many trees show that my 3 x great aunt Elizabeth Clark born 1814, daughter of Robert Clark and Agnes Cousin, died in Ontario Canada in 1895 aged 80/81. I know that she married Charles McKinnon on the 13th Dec 1835 in Lanarkshire Scotland. They are on the 1841 census for Glasgow Scotland, then disappear. I don't know how many children the couple had, or when her husband died. Some ancestry users say they lived in Lanark County Ontario on the later censuses of Canada.