The name index under construction from Milwaukee's German papers includes Niehusen entries for a Caroline/Karoline and Emma (née Drieschmann); as well as Wilhelmina (Niehusen) Schroder.
Contact me directly for specific citations. I'm happy to provide this information from the most current version of the data. Indexing started in 2007, and will continue beyond 2011.
Milwaukee's German Newspapers; an index of death notices and related items; 1844-1930, addenda 1931-1950