I found a record for Betty Marinovich, I hope it is of some help. Very difficult when you don't have much info eg. Birth place, Marriage place Etc. Follow this link, "Montana, County Births and Deaths, 1840-2004," database with images, FamilySearch(https://familysearch.org/ark:/61903/1:1:QKNR-X4LV
Good luck with your research.