Hi,
In case it should prove useful, although it looks now as if the Hanes name is not the one.
Although it says this Maria was born in Cookham, she is the same age as the Maria in the 1841 census, so maybe worth investigating.
1851
MORTIMORE, Martha Head Widow 76 Formerly Servant Hertfordshire
HAYNS, Maria Nurse Widow 75Nurse Cookham, Berkshire
Piece: 1694 Folio: 165 Page: 19 sched 98
Civil Parish: Bray.
Address: Number 31,Jesus Hospital Or Bray Almshouses
Deaths Sep 1865
Haines Maria Cookham 2c 247
Deaths Jun 1846
Haynes Charles Cookham 6 111
Berks Burial Index has a Maria Haines age 87 of Cookham Union House Maidenhead buried on 18th July 1865, and a Charles Haynes age 81 of Maidenhead on 9 June 1846. I could not find Maria in 1861.
Do you have the baptisms of any of John Emmett and Sarah's children?? Some are on familysearch
Vicwinann