"I have her parents as Gustave and Dorthea Zahn of Hamburg, Germany. Both reportedly died in Milwaukee, WI."
I've indexed death notices for a Dorothea & a Gustav Zahn published in local German newspapers -- about 240 Zahn entries indexed since 2007 and the work continues.
More information available from compiler/editor:email@example.com
"Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950)