Thank you so much! So the word that I thought was "Killian" is "Wittwe". Exactly one letter correct. Another word to add to my list of those I can recognize. Now that I know how the writer made "W", it will help in other transcriptions.
As for cause of death, possibly it is an expression meaning "old age". In a future record, Rozalie's daughter, also named Rozalie, lived to be age 80 or so. Actually, I don't think they died that far apart. The household seemed to have many elderly relatives in it.
Again, thank you.