Are you certain she was just named Hilda Britton?
There is this marriage reg
Mar qtr 1823
Pontypridd
Hilda M Britton
spouse: Williams
and this birth
Hilda may Britton
Mar qtr 1900
Pontypridd
11a 589
If a BMD is registered in Pontypridd -that is only the registration district and does not necessarily mean they were born/married/died in Pontypridd itself
Some of the areas covered by Pontypridd reg district are (as well as Pontypridd itself)
Aberdare, Eglwysilan, Llanfalon, Llantrisant, Llantwitfadre, Llanwonno, Rhondda, Ystradfodwg
Suz