Jane was still alive in 1911. Age 78, born Newbridge. Even though she was widowed she gave number of years married - 52 - and recorded that there had been seven children born to her marriage, with six still living.
And the James Kelly-Jane Smith marriage was in Newbridge, 13 Feb 1859!https://registers.nli.ie/registers/vtls ... 4/mode/1up
With son Patrick baptized there, 8 January 1860 (and he is with them in 1871, age 11)
The only plausible death I can see in West Ham district for Jane is March 1922, age 87. That death may have been in the Leytonstone area.
Two possible deaths for James Kelly in West Ham, 1901-1911, I still think the 1910 may be the likelier.
I can't see a burial online for that one. St. Patrick's Roman Catholic Cemetery, Leytonstone, may be a possibility.