Her obituary in the Ottawa Citizen, May 5, 1911:

DENMARK-On May 3rd, 1911, at ?? Laurier West, Mary Ann Whitehead beloved wife of Aron Henry Denark, aged 83 years. Funeral Saturday, May 6 at 2 p.m. from above address, to Beechwood cemetery.

The 1901 census for Wellington Ward, Ottawa, has her born December 11, 1830 in England, and having her arrive in Canada in 1844.