She seems to have been widowed when she died in Suffolk in 2006.
A couple of death possibilities for Charles in Enfield?
Sep 1971 Enfield
Charles Thornton, born 21 Aug 1903
Sep 1973 Enfield
Charles Thornton, born 29 Jan 1911
Baptism for Charles born 1903
Charles Thornton Birth Date: 21 Aug 1903
Baptism 14 1903 Saint Pancras Parish Church, Camden
Father: Thomas Francis Thornton, coach painter
Mother: Emma
With his parents 1911
https://www.familysearch.org/ark:/61903/1:1:XWLR-F44Edit to add
Thomas married 18 Feb 1889 Emma Breach
THORNTON, CHARLES Mmn BREACH
1903 S Quarter in ST. PANCRAS Volume 01B Page 74