It's possible that Mary has no headstone.
Burial: Brookside Cemetery West Branch Ogemaw County Michigan, USA
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K42C-8LM : accessed 22 July 2017), Mary Jane Adams in household of Victor Adams, Hampton Township, Bay, Michigan, United States; citing enumeration district (ED) 9-42, sheet 10B, line 54, family 206, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 1729.
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