What is the relationship between these women? Who is who?
Since Nicholas' mother, Anna Margarita Euler Berlin was probably born about 1720 it is unlike that she is buried here. She probably died before 1810. Some researchers claim she died between 1804 and 1810 (although without sources). She probably came west with her son, Nicholas and may have died in Westmoreland County.
It is thought that Daniel's first wife died in 1829 near the birth and death of a child. There is also a George N. who died in March 1829 who is buried here. That would mean that #4 Mary A was Daniel's first wife.
It is also believed that Anna Maria, the wife of Nicholas died after 1836. She was born around 1750. This would probably mean that #5 was the wife of Nicholas and then #3 could have been his daughter.
So is #1 an unknown daughter or does it indicate that some record about Daniel's second wife is incorrectly transcribed?
Knowing that middle names were often switched with first names and sometime names were anglicized could Anna Maria be Mary Ann? Only time and more research will tell. This cemetery record while wonderful to have creates more questions than answers.