Hi.
I can't see any Margaret Davies on my family tree for that period of time.
However, I have discovered that the Davies surname only came into effect after a Llewelyn Davies (1814) took his father's first name David Llewelyn (Bwlch y Clawdd farm Llangeler, born 1784) as his surname, as was the custom at the time.
Therefore, you may be looking for a David...... as Margaret's father?
I hope this makes sense.
I also contacted the owners of Alltygolau farm (they have a website, google Alltygolau)who provided me with some information and may be of help.
GPJ