NameElizabeth Mertz 
Birth1775
Parent-Proof notes for Elizabeth Mertz
Meiser gives her birth date as 7 Jun 1781 but does not state where he found it. He does not give a date of death, so I doubt it's from a tombstone. He states that Isaac, Abraham and Jacob were baptized at Longswamp -- and that is correct. Elizabeth was not, nor any of the other children. I do not believe her date of birth was 1781 as it conflicts with what I think I know about Jacob. Also, since she was consistently listed first among the females in the Orphan's Court filings, I believe she is older than Mary Magdalena.
Research notes for Andrew (Spouse 1)
Meiser says Elizabeth was the wife of Adam Strayer, Fisher says Betsy was the wife of Augniger. Isaac, Elizabeth's brother, in his petition to the Orphan's Court, says Betsy was the wife of Andrew Strayer.