
Ok - forget that lot, I think you have the wrong Sarah in 1841, I have just found her with 2 others of her sisters still unmarried and visiting in Banbury in 1851 so that one can't be yours.
I looked at the transcripts for Banbury and although there are no COWPER baptims at that time there are 2 COWPER marriages,
1840 Thomas Webb fa whitesmith s/o Henry
to
Anne Cowper fa d/o Richard - butcher
and 1849 John Webb s/o Henry
to
Elizabeth Cowper aged 28 d/o Richard - butcher
from the age on Elizabeth's I found a baptism 1820 Elizabeth d/o Richard & Mary COOPER of Oxford Bar Banbury, butcher
they also had Ann in 1816
Georgina in 1808
SARAH in 1805 (Sept 9)
Edmund in 1802
the surname in each case is given as COOPER but 2 of the daughters used COWPER when marrying, the occupation for Richard is right but Sarah's birth is a bit earlier than you were expecting, what do you thank?
DebbieG