probably died of black croup

The census was taken in August 1880 and lists her age as 8/12 (8 months old). Her tombstone gives her date of death (21 Apr 1887) and her age at death as 6y, 4m, 21d. If this is true she would have been born in November of 1880 and would have been impossible to be on the 1880 census. So, for now I am going to assume that her tombstone is incorrect.

Zoar Lutheran Church burial records give her death date as 21 April 1887 and list her age as 6y 4m 1d.606