To find a death record (in whatever form it might have been recorded), you need 3 key pieces of information: name of deceased, place of death, date of death.
You have Katherina's given name and since she died before her husband, a surname (Bahler) (NB variant spellings). From the information in your query, she probably died in the 1890s, somewhere in the USA, likely in her early 50s. (Age at death or birthdate helps to distinguish between people of similar names).
You need to narrow down the date and determine at least a county of residence as a starting point to search for death or burial records (see my comment to the query, above). Most states did not mandate death certificates until the 20th century. However, many counties did track deaths. And churches kept burial records for their members.
Without defining date and location, random searches in national databases will be a waste of time as you probably can't be sure that a match is the right person or that the collection is complete for early dates and error-free.
Without a jurisdiction, you are looking for a needle in a field of haystacks. Without a jurisdiction, even we can't tell you what records may have been generated or where they may have been archived.
[Note: the original poster has not not returned to G&FH.SE since leaving the query. I had hoped that I would at least get some additional details before responding].