Her birth year often seen as 1717 may be in error. The Moravian records give that year as the birth of her sister Amelia Elizabeth. Charles Burgess, HFFA historian, believes she was the youngest. I have wondered if they could have been twins.
Elizabeth Frey signed her father's deed to her brother Jacob, 4 Mar 1743. There is a statement dated 18 Aug 1735 whereby Johannes Muller acknowledge receipt of ten pounds from Jacob Fry as payment in full of any legacy. So they were married by that date.
On 17 Mar 1747, Rev. Michael Schlatter baptized Elizabeth Miller and eight children at Dr. Miller's home. A child had died a few days previously.
Elizabeth is buried in the Zeiber Schwenk Burying Ground, Frederick Township, Montgomery Co PA. Her stone is marked E. B. M. 1758; Johannes stone has J. H. M. 1755. The records of the cemetery give Elizabeth's birth as 1717.
Here is one set of children from an online database. Accuracy unknown