Collier birth/baptism

[Theli p]

Further to my earlier question about the Colliers I now have a bit more information. Robert Collier married Hannah Oborn on 18th Apr 1814 in Frome. It was witnessed by Aaron Button who later married Hannah when she was widowed.

Can anyone find any births/baptisms for their children between 1814 and 1821?
I am specifically looking for Eliza, Betsey or Elizabeth. Hmm all very similar I know that is why I need help. I still wonder if Aaron took on one of Hannah's children so she called herself Button although she was a Collier.
 Thanks Theli p