Mertz Genealogy - Person Sheet
Name4G GM Maria 
BurialLutheran and Reformed Cemetery, Kratzerville, Snyder Co, PA2167
Find-a-Grave notes for 4G GM Maria
http://findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=69099329She is listed on find-a-grave as a daughter of George Diehl because Jim Diehl noticed on her tombstone the inscription which says of daughter of George und C Deal. Others have transcribed her tombstone as indicating 1764 birth, ruling out that she was the daughter of the George Diehl she’s buried next to.
The only explanation that takes both “facts” into account is that she was the wife of Georg Diehl buried next to her and daughter of George and C Diehl — whoever they were.