Found this on 1871 census:
MASSON, Ellen Daughter F 11 1870 Scholar born Findhorn, Morayshire, living in Kinloss, Moray, father Alexander, fisherman and mother, Isabella. Still with them in 1891 census.
1881 Census: MASSON, Ellen Daughter F 7 1874 Scholar
born Fetteresso, Kincardineshire, living with Mother Isabella, widow in Fetteresso
Also: in Aberdeen St. Nicholas - MASSON, Helen Daughter Unmarried F 7 1874 Scholar
born Aberdeen, Aberdeenshire, living with mother Ann, widow, mangle worker.
Also found a Helen Masson emigrating to Montreal Canada in 1911 with a Stewart Masson, who was not her husband (?her brother) on the Hesperian.
Don't know if that is any help, or simply a wild goose chase. Good Luck!\
Jean