"Canada, New Brunswick Provincial Marriages 1789-1950", , FamilySearch (https://www.familysearch.org/ark:/61903/1:1:QVBF-KJNF : Tue Oct 24 04:32:05 UTC 2023), Entry for William Chalmers and Matilda Brown, 30 Nov 1846.
Find a Grave, database and images (https://www.findagrave.com/memorial/103761469/matilda-chalmers: accessed 17 January 2024), memorial page for Matilda Brown Chalmers (29 Oct 1827–5 Apr 1903), Find a Grave Memorial ID 103761469, citing Methodist Cemetery, Woodstock, Carleton County, New Brunswick, Canada; Maintained by Beverly Quigg Kirk (contributor 48093671).
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https://archives.gnb.ca/Search/VISSE/141C4.aspx?culture=en-CA&guid=aed2a0d1-c350-4a2d-893e-deb96a647186 - Provincial Returns of Deaths for CHALMERS, MATILDA (b. Scotland - d. 5 April 1903 at age 75)
This also seems to be the same person: https://archives.gnb.ca/Search/Cemeteries/Details.aspx?culture=en-CA&Key=80144 - New Brunswick Cemeteries for CHALMERS, Matilda [Born: 1827-Oct-29 - Died: 1903-Apr-5} [buried at Methodist Cemetery, Carleton County. Wife of William Chalmers]