Her year of birth is probably earlier than F-A-G has listed, if this is the correct Mabel:
"Vermont Vital Records, 1760-1954," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XFD9-XV8 : 11 February 2018), Eddie P. Smith and Mabel E. Martin, 17 Aug 1901, Marriage; State Capitol Building, Montpelier; FHL microfilm 540,118.
1920; Orange, VT; 37
1940; Randolph, Orange, VT; 58
Find A Grave: Memorial #25371293:accessed 19 October 2018), memorial page for Mabel Smith (3 Mar 1903–23 Sep 1991), citing Forest Hills Memorial Park and Mausoleum, Palm City, Martin County, Florida, USA ; Maintained by Shirley Bybee (contributor 46787619) .
Kitty Smith created WikiTree profile Martin-12841 through the import of John Bland Smiths.ged on Jun 4, 2013.