Mary was born in 1869. As per 1901 Census, we can see that she was married to John Buttler. I also know this through direct family knowledge. The 1901 Census also points out, Both Mary and John Buttler were alive in 1901. She passed away after 1902.
"England and Wales Birth Registration Index, 1837-2008," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2X72-P16 : 1 October 2014), Mary Sullivan, 1869; from "England & Wales Births, 1837-2006," database, findmypast (http://www.findmypast.com : 2012); citing Birth Registration, St. George In The East, London, England, citing General Register Office, Southport, England.
Cencus Record 1901 "England and Wales Census, 1901," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:X9DS-NL9 : 20 May 2019), Mary E Butler in household of John Butler, St George in the East, Middlesex, England, United Kingdom; from "1901 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing St John subdistrict, PRO RG 13, The National Archives, Kew, Surrey.
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