At Rachel's marriage the witnesses were John Jenkin and Ann Jenkins. There is an 1845 will of John Jenkins of Llanfoist, online at National Library of Wales. He leaves his estate called the Wern in Llanellen in trust to John Davies for the benefit of his daughters, Ann Jones, Rachel Davies, Elizabeth Evans, Rebecca Pritchard and Theodosia Williams.
Because Rachel was married and died in Llanfoist but was buried in Llanellen, I think it would be worth further investigation to see whether this might be her family. It is possible the baptisms were in Llanellen. I have researched a family with connections of this kind in two parishes.
Drosybont