« Reply #10 on: Saturday 18 July 15 20:28 BST (UK) »
have you tried ordering from the registrars in Swansea? That way you can specify name for father & they will only issue if it meets your info.
http://www.swansea.gov.uk/article/2502/Copy-certificatesYou can do the same with the GRO site if you do not put the reference. But if it's one of the registrations that didn't make it to the GRO, that won't help.
I wouldn't have thought the Haverfordwest regs were likely as her place of birth is given as Swansea. If she was born in the Robeston Wathen area, the registration would show up as Narberth. There are these
Martha Jane Davies june qtr 1877 Narberth vol 11a pg 886
Martha Jane Davies march qtr 1878 Narberth vol 11 pg 848
Both of these can be accounted for on the census, one with father George, the other father Stephen.
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