While you are waiting.....
I wonder if Eliza's father remarried?
The IGI
http://www.familysearch.org/Eng/Search/frameset_search.asp?PAGE=igi/search_IGI.asp&clear_form=truehas the following bpts for parents John and Sarah,
bpt at St Michael Bedwardine
Caroline 5/12/1826
Eliza 25/12/1827
Mary Ann 7/2/1830
Edwin 29/5/1831
Plus at a Methodist chapel ? same couple
William Henry 1/6/1834
Enoch 24/4/1836
and at St Swithin
Ellen Mildred 22/11/1833
The 1851 census has
Piece 2042 Fol 252
St Swithin's, Worcester
74 High St
John Banks,head,45,fruiterer,Worcester,WOR
Hannah Banks,wife,43,Malvern,WOR
Mary Ann Banks,dau,20,S.Michael,WOR
Enoch Banks,15,S.Michael,WOR
John Banks,13,S.Michaels,WOR
Ann Dance,lodger,wid,78,Malvern,WOR,formerly greengrocer
Caroline Chadd,serv,21,house servant,Hanley Castle,WOR
Piece 2042 Fol 777
St Peters,Worcester
Sidbury (Red Lion Public House)
Elizabeth Dance,head,w,33,Inn Keeper,Windsor,BKM
Elizabeth Dance,dau,11,Worcester,WOR
Eliza Banks,neice,23,Worcester,WOR
+2 servants
So far so good, then I looked in IGI for a marriage for John and found:
John Banks to Hannah Tyler, 15/10/1832, St Michael Bedwardine
so if this does all go together then Sarah presumeably died between Edwin's birth and John's remarriage ie 1831-1832
(Comes with a public health warning that it might all be a load of rubbish
)