NameDorothy N Mertz 
BirthSeptember 1899
Census History notes for Dorothy N Mertz
1930. Robert E Craig age 31 married at age 24 assistant treasurer for iron company lives in Philadelphia with wife Dorothy age 30 and children: Barbara A 6, Dorothy 5 and Robert 3. This may well be Dorothy Mertz, but I do not have any clues other than that she married Mr. Craig, lived in Philadelphia and married after the 1920 Census and before 1925 -- so it all fits.
My Comments notes for Dorothy N Mertz
I know she is a daughter of William Lincoln and that she was married to Mr. Craig and lived in Philadelphia in 1925 at the time of her mother's death. I believe she is Mrs. Robert E Craig and I have plugged his information and their children in for Dorothy -- but I do not have solid proof I have made the right connection.
The children are: Barbara A 1924, Dorothy 1925 and Robert 1927.