This looks like Catherine in 1851.Wind Street,Llanelly
H0107 Piece 2468 Folio 333 Page 20.
Catherine Davies,Wife,64,Bread Baker,Llanelly.
Anne Davies,Dau,20,Llanelly.
John Howell,Lodger ,44,Railway Lab,Llanelly.
This is only family that matches in 1841.
Thomas Street,Llanelly.H0107/1379/4.
All born in County.
John David,50,Collier.
Catherine David,50.
Margaret David,13.
Anne David,10.
Now Ancestry could have mistranscribed Davies as David in 1841.However i have in my Tree and know of other people researching the surname David/Davies , that the surname was originally spelt David and later on down the generations changed to Davies.Hope that makes sense.
Best Wishes Welsh Lady