She is listed as 33 in the 1861 census for Huntley, Ontario (so born around 1828).

In the 1871 census, she is shown as being 44 (so born around 1827).

I can’t find her in the 1881 census. In the 1891 census, she is shown as widowed, age 64, being born in Ireland (and her father in England). The two youngest kids (Maud and Ernest) are with her. This is in Nepean, Ontario, and was taken April 17, 1891.

In the 1901 census for Ottawa, she is living with her daughter’s family (Fred Mitchell), where it mentions that she immigrated to Canada from Ireland (should be England, I believe) in 1832. That should roughly be correct (although it shows her being born in 1827).