I realize that you posted this 10 years ago, but if you're still looking for information on these people, you might want to check out http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=mu...
According to this link, Antonia Vrbanac Muretich was born 2 Nov.1880, and died 29 Oct. 1968. She married Anton Muretich (1876 - 1952)and is buried in Naylor, Ripley, Missouri.
I stumbled upon your query because I have ancestors that I'm trying to locate with the Moretich, Verbanac, Kasun surnames in the Severin na Kupi/Lukovdol area.
Hope this helps!