« Reply #11 on: Monday 08 February 10 10:35 GMT (UK) »
I've looked for her as well with no luck. I can't see a likely family in Pembs either. I've looked at every David Nicholas in 1871 who was a farmer/ag lab/farm servant and none of them have a John of the right age in a following census.
Sorry, I'm joining in your stumped-ness.
Cornwall: Allen, Bevan, Bosisto, Carnpezzack, Donithorn, Huddy, James, Retallack, Russell, Vincent, Yeoman
Cards: Thomas (Llanbadarn Fawr)
Glam: Bowler, Cram, Galloway, James, Thomas, Watkins
Lincs: Coupland, Cram
Mon: Cram, Gwyn, John, Philpot, Smart, Watkins
Pembs: Edwards (St. Dogmael's)
Yorks: Airey, Bowler, Elliott, Hare, Hewitt, Kellett, Kemp, Stephenson, Tebb