Once again Margp for your input.I think there is a bit of confusion here, Jane Eliza's maiden name was Green, her married name was Threadwell, her husband John Threadwell died in 1869. I have accounted for her up until 1871 where she was living as a widow with her youngest son John aged 8 years born in Stratford and living in Barking. I cannot find Jane or John anywhere on the 1881 census.
I hope this explains things better.