Another long shot:-
In the baptism records for Elizabeth and Samuel,children of Thomas Edwards and Anne Williams,her parish is given as Llanbeblig.Assuming she was not just resident there,but born there and assuming I have the right burial to give her dates as 1780-1816,there are three possible baptisms(given a +/- 2year tolerance)
One,interestingly is Dec 1779,daughter of Richard Williams(labourer) and Frances.
There is a marriage in Nov 1779 between Richard Williams and Frances Edwards which could fit.
There is a burial record for Frances Williams,South Penrallt,Llanbeblig which would give her as 1760-1839,and a baptism record for Frances Edwards,1759 to Thomas and Moclan(??)
Richard Williams is more difficult.There is a burial record for a Richard 1752-1814,but no abode details and I can't see a will for either of them.
It could all be just coincidence of course,I can't see any obvious way of proving it.
Regards
Roger