Hi Ruskie,
After searching through papers, I have the marriage certificate for John Robinson, Farmer, Helpringham and Rebecca Day, 19th May 1847, although her father's name and profession has a black line of ink in, it doesn't say her father was deceased. Residence is listed as New Sleaford.
Census
1841, Rebecca Day, resident, New Sleaford, birthplace Lincolnshire
Married 1847
1851, Rebecca Robinson resident, Helpringham, birthplace Boston, Lincs
1871, Rebecca Robinson, resident Surfleet, birthplace Boston, Lincs
1881, Rebecca Robinson, resident, Surfleet, birthplace, Wildmore Fen, Lincolnshire
1891, Rebecca Robinson, resident, East Retford, birthplace, Boston
The 1881 census helped with the name Wildmore Fen, can only hope this is the place. After looking online about the history of the area of Wildmore Fen, it was a newly drained fen creating new village(s), it looks as if a church was set up in 1816, the year of Rebecca's birth 1814. Although I am slightly clucthing at straws, have found the lincstothepast.com website really helpful, although still no sign of Rebecca Day, although still unsure if I am heading in the right direction. Will keep on searching :-)