In case this is helpful to your research there was an obituary for Jacob Odenbrett in March 1928, possibly in the English language papers too. The family did not publish notices for Gertrude in the German papers. As you might imagine, the earlier Odenbrett generations are well represented in the local German papers. There are about 60 Odenbrett entries in the current version of "Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950). Other surnames referenced with Odenbrett include Hessen Holz Luenzmann Lünzmann Himmelstein Adler Wurst Würst Wuerst Casper Stolz Tankre.
Gary Rebholz, originator/compiler/editor
Indexing Milwaukee's German newspapers continuously since 2007... helping to access our historic German-American culture.