Her name is listed as Margaret Mary in the death record for her son Edward.
Sources
"England Marriages, 1538–1973 ," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:N6R2-Z44 : 10 February 2018), John Burdett Wittensom and Margaret Mary Teasdale, 23 Oct 1815; citing Wiltshire, England, reference item 7, index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 1,278,695.
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