Her estimated birth year based on the 1901 census is 1859. Based on the 1911 census it would be about 1851. Her marriage record would suggest about 1860.
Sources
Daughter Mary's birth record, 1894, Ireland, Roscommon SR District, Ballyleague Registrar's District, Group Registration ID 10617060 [1]
Census of Ireland, 1901, Roscommon, Cams, Clooneenbaun, House 11 [2]
Census of Ireland, 1911, Roscommon, Cams, Clooneenbaun, House 8 [3]
Marriage record, 05-May-1879, Ireland, Roscommon SR District, Group Registration ID 2652526 [4]
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