Mary's daughter Elizabeth said, on the 1900 US Census, that her mother was born on Prince Edward Island. Elizabeth gave different years of birth, but she was born sometime between 1827-1835. Her mother would have been born around 1805 - 1815.
Information on Elizabeth's death record was provided by her daughter Flora. Flora said both of her grandparents were born in Prince Edward Island, contradicting her mother's entry on the 1900 Census. She may not have known her grandmother's maiden name. Flora was about 7 when her parents left Prince Edward Island.
It seems unlikely that the find a grave entry is the right mother for Elizabeth. Both the age and place are wrong.
Find A Grave, database and images (https://www.findagrave.com : accessed 01 October 2018), memorial page for Mary McIntyre McIntyre (1826–1864), Find A Grave Memorial no. 128383409, citing Kilmartin Cemetery, Central Elgin, Elgin County, Ontario, Canada ; Maintained by 4ever Nanny (contributor 47345810) .
Web: Canada, GenWeb Cemetery Index Outdated Ancestry image link:2zJHfKm Ancestry.com. Web: Canada, GenWeb Cemetery Index [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2013.
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Featured National Park champion connections: Mary is 20 degrees from Theodore Roosevelt, 22 degrees from Stephanus Johannes Paulus Kruger, 18 degrees from George Catlin, 22 degrees from Marjory Douglas, 29 degrees from Sueko Embrey, 19 degrees from George Grinnell, 31 degrees from Anton Kröller, 19 degrees from Stephen Mather, 24 degrees from Kara McKean, 19 degrees from John Muir, 22 degrees from Victoria Hanover and 31 degrees from Charles Young on our single family tree. Login to find your connection.