have got myself in a muddle, Machynlleth records

[malijibic]

There is a baptism for Jane John in Darowen 13 Feb 1778, parents John and Judith.
Will written 7 day of October 1780. proved 8th May 1781.
Margaret baptised 4 may 1781. Parents John and Judith
Is this enough proof to say that Judith, the mother of Margaret, married
1)  John David
2)  Rowland Oliver

 If it is I am one generation further on.  Thank you for your help.

[malijibic]

Results of a trip to the archives
John David buried 13 Oct 1780, 6 day after making his will.
Judith Edward wife of Rowland Oliver buried 18  May 1789.
But on the same page there are
Elizabeth Morris wife of Evan Richard
Margaret Owen wife of William Bebb
and looking at other pages it seems that married women kept their maiden name.
Thank you for your help and interest.