What are Catharine Kubacki's dates? Since you included Kubatzki in your message there's a possible Kubatcki match of death notices in the local German papers.
There are about 50 occurrences of the Merkel name indexed in "Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950).
Gary Rebholz, compiler/editor
Milwaukee Wis.
gary.rebholz@gmail.comIndexing Milwaukee's German newspapers continuously since 2007 ...