According to the book "St. Michael's Evangelical Lutheran Church, Germantown (Now Part of Philadelphia) Pennsylvannia, 1741-1841 Volume I" compiled and edited by Frederick S. Weiser and Debra D. Smith, CGRS Anna NILL was Agnes (NILL) Gomminger.
Sara, dau. of Jacob and Agnes Gomminger, b. 15 Mar 1791, bp. 13 Jun 1791. Sponsor: the grandmother, Anna Nill.
Hope this helps,