Anna is Ferdinand and Henrietta’s second child and daughter.

1900 US Census: Anna [age illegible] is living with Ferdinand and Henrietta and attending school.

1910 US Census: Anna [21] is living with Ferdinand and Henrietta and working as a housemaid on the home farm. If 1887 is the accurate birth year, she would actually be 23.

I haven’t found any other records for Anna so at this time.

Most genealogy sites list Anna M, as dying as an infant in 1887, but the 1900 and 1910 US Census records prove that is incorrect.

Ferdinand’s and Henrietta’s shared headstone includes the name of 2-4 children without birth/death dates.
Either Anna Mary & Emma Frank or Anna, Mary, Emma, and Frank.

Where two daughters named Anna? Is it the same Anna who possibly died in her 20s and is interred with her parents?