Emma Kefford married Richard Edwin George in the September Quarter 1865 at Stepney (Vol 1c p1060). She appears on the 1871 Census at Sutton, Bedfordshire with her parents, James and Rachel Kefford and three children: Marian b1866, Richard b1868 and Annie b1870. Her husband Richard Edwin George does not appear to be there - perhaps he was back in the docks around Stepney.
Emma Kefford was born c1843-44 at Sutton. It is possible that her GRO birth entry was as "Female" in the Dec qtr 1844 at Biggleswade (Vol 6 p62). For some reason, several Kefford births were registered as either male or female by the Sutton Kefford families at this time.
James Kefford married Rachel Brown at Sutton on 23 May 1831. I think she was his 2nd wife.