No obit but here is her death registration
Mary Brown, 75 yrs, b Brock Tp, d 10 Sept 1915, widow, d/o Archie Currie, no mother listed, informant: Archie Brown of Cannington, died of heart disease/found dead. Registration # 023652, Brock Tp, Ontario County.
1901 and 1911 census on www.automatedgenealogy.com
1881 census on www.familysearch.org