Informant at death of James and Mary French son Charles in 1841 was Jane French (her mark) - probably this one.
In 1861 she was working as an Ag. Labourer and living close by Green Gate Row at 12 Pigwell Lane, Plaistow, Essex with sons Henry and William.
Jane married Charles French, son of Peter French and Mary, on 10 Oct 1819 in West Ham.1 (Charles French was born Cal 1795 in East Ham 5, christened on 14 Nov 1792 in East Ham Parish Church 1 and died on 12 May 1854 in Leyton Workhouse (aged 68) 4.)
1 GenesReunited, http://www.genesreunited.co.uk, Val Stuart.
2 Ancestry.com Online Census and BMD, www.ancestry.com, 1861C.
FreeBMD Online Index of BMD, England & Wales, www.freebmd.org.uk, Deaths Sep 1872
French Jane 68 W. Ham 4a 16
4 General Register Office (England & Wales) Certificate, http://www.gro.gov.uk/gro/content/home.asp, Death.
5 Ancestry.com Online Census and BMD, www.ancestry.com, 1841C.