The Penn Historic Society has a document detailing the many children of John Miller. It lists an Anna Miller: born Nov. 2, 1740. married John Manburger (I think I'm reading that right). Is that this woman? The 1729 date doesn't make a lot of sense for John to father a child. Age 19, unmarried .... this profile also describes a person who lived to be at least 92 years old -- unrealistic, given lifespans at the time. John Miller himself died at 54, for example.
https://www.geni.com/documents/view?doc_id=6000000190981984825
