She was the daughter of the Rt. Hon. Charles Watkin Williams-Wynn and Mary Cunliffe. She married James Milnes Gaskell the son of Benjamin Gaskell on the 16th of May 1832.She died on the 21st of April 1869.
"England and Wales Census, 1851," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SGJJ-W9L : 24 July 2016), Mary M Gaskell in household of Benjamin Gaskell, Brighton, Sussex, England; citing Brighton, Sussex, England, p. 36, from "1851 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO HO 107, The National Archives of the UK, Kew, Surrey.