My great grandmother was Helena/Helen/Lena Zagar. She was born abt 1887 and immigrated to Kansas City, KS with her husband Joseph Stampfel. I am trying to find more information about her. Perhaps she might be a relative of your gr-grandmother Juliana. BTW I am from Kansas City as well, and I remember a Katz's Drug Store growing up.
Good luck with your search. Any information would be great!!