I agree that it doesn't look as though Maria REEKS is Mary Jane's mother. On Mary Jane's birth certificate it does not give a maiden name for Maria. Perhaps Mary Jane was illegitemate. If James was dead by this time, Mary Jane could have been born out of wedlock. Perhaps quite a few unmarried girls or widows went to the Chepstow workhouse to give birth away from their own neighbourhood.It would be nice to find Mary Jane in the 1871 census that may give us a clue.