She may have been called Mary.
Margaret married William Corfield, son of Cornelius Corfield and Elizabeth Reynolds. (William Corfield was christened on 5 Oct 1760 in St. Mary's, Stottesdon, Shropshire, England. 1 2 and was buried on 14 Apr 1797 1.)
1 Justin J Corfield, The Corfields: A history of the Corfields from 1180 to the present day (ISBN 0646143336).
The Church of Jesus Christ of Latter-day Saints, Family Search Digital Record.