Sophia died on November 14, 1857, aged 18. She was buried in Briggs Burying Ground, Pembroke, Plymouth County, Massachusetts.
Sources
Briggs, Vernon L. ;History and Genealogy of the Briggs Family 1254-1938 (Charles E. Goodspeed & Co. Boston 1938);vol. II, p. 591
Find a Grave, database and images (https://www.findagrave.com/memorial/105772841/sophia-briggs: accessed 18 August 2023), memorial page for Sophia Briggs (21 Nov 1838–14 Nov 1857), Find a Grave Memorial ID 105772841, citing Briggs Burying Ground, Pembroke, Plymouth County, Massachusetts, USA; Maintained by Beverly Burnett (contributor 46898315).
"Massachusetts Births and Christenings, 1639-1915," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VQ6C-VYM : 4 December 2014), Sophia Briggs, 21 Nov 1838; citing PEMBROKE,PLYMOUTH,MASSACHUSETTS, ; FHL microfilm 0873752 IT 1.
"Massachusetts, Town Clerk, Vital and Town Records, 1626-2001," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:FH3C-HG7 : 10 November 2020), Sophia Briggs, 14 Nov 1857; citing Death, Pembroke, Plymouth, Massachusetts, United States, Massachusetts Secretary of the Commonwealth, Boston; FHL microfilm 007009265.