Hi Bill,
Assuming she survived her husband, and did not remarry after his death, this record in 1951 is the most likely for her death
"England and Wales Death Registration Index 1837-2007," database, FamilySearch(https://familysearch.org/ark:/61903/1:1:QVCX-PP5C : 4 September 2014), Maud Dunn, 1951; from "England & Wales Deaths, 1837-2006," database, findmypast(http://www.findmypast.com : 2012); citing Death, Barnstaple, Devon, England, General Register Office, Southport, England.