1. Yes Anna died in 1888.
2. Children & Anna Lived in Iowa either Jackson, Clinton or maybe even Dubuque County.
3. On the census one of the questions that one of the children of Anna answered (when he was adult - when came to US or something like that. 1885
a. Would the children of Anna have been Naturalized? One of the boys was listed as a hired hand in think in 1890?
4. Went through the National Archives online, but found many Anna's. I was hoping it would show records so if she were traveling with 3 children and the dates, but so far this resource has been difficult to use
a. The American version was Miller - I was told by a family member it was originally Mueller while in Germany so searched in Archive under that.