Sowell, Sewell etc - Graveley, Hunts

I am a new member and have a problem with my research. My G.G.Grandfather John Endersby married Edith,( Ede, Edy) Sowell at Graveley Hunts 11-03-1815. This is from the Graveley Parish records. Edith states that she was born in Graveley on the 1851,61 census. Her name is spelt Sowell on her daughter's birth certificate. She seems to have died between 1861 and 71 but I cannot find her death. I am also interested in her parents but so far cannot find any information about her. John was a master Tailor who died in 1860 in Wrestlingworth, Edith registered the death. I have the certificate. Can anyone help me please? Thanks Joy Wilson