Barbara Ford's The Oberholtzer Book identifies Magdalena DETWEILER on page 19. The alpha-numeric codes are from the book.
MC19 Abraham Overholt c1739-7/13/1812 Plumstead Twp, bur Deep Run East, m 1761/62 Magdelena Detweiler b 7/4/1739 REF: Bucks Co Will #3866, 1812; OFA BULLETIN Feb 1992 pp 5-6
The MC designation refers to Marcus Oberholtzer c1664 Europe-1726 Coventry Twp, Chester Co m Elizabeth [-?-]. This Marcus is my direct ancestor. Their first child, Jacob, is MC1.
MC1 Jacob Overholt c1699 Europe-wp 11/7/1760 Plumstead Twp, Bucks Co m Barbara [-?-]. Their 9th child, Abraham, is MC19. Additional data for MC19 Abraham's line cover 2 1/2 pages. The code wp means "will proved."
Barbara Ford may have even more information available, if you need it. Her e-mail address is: firstname.lastname@example.org .
My own family line goes from MC Marcus Oberholtzer to MC7 Martin Oberholtzer to MC72 Henry Oberholtzer/Overholt to Henry's 10th child, MC720 Abraham Overholt, my ggg grandfather.