Maria Anna of Aulzhausen.
Maria Anna and her husband Georg Geÿerhos live in House Number 29, near the main Baÿerl dwelling of this period. She is from the next village to the west that is within walking distance. I do not yet know if she fits into the family line, but it seems possible. I am seeing examples of people from the same family whose names are spelled Baierl by some scribes, and Baÿerl by others. Of interest is a family in Todtenweis named Baÿerl/ Baierl whose house is very near that of the Helfers. (Recall that Leonhard Baÿerl of Affing marries Kreszenz Helfer of Todtenweis!) I later found a subsequent version of the same register prepared by the same person, presumably in 1868. Maria Anna's name is spelled the same way: Baierl. There are more children now.
[Note added 7 June 2015: As it happens, Aulzhausen appears to be an ancestral home of my Baÿrl family. I found a baptismal record of Michael Baÿrl (spelled Pairl) who moved to Frechetsholzhausen and Edenried. I will place a link to that journey of discovery later. Anna above is probably a cousin. I will try to find her in Aulzhausen too.]
See also Caroline Baÿerl of Gundelsdorf.