Gudrun Byron with the birth and death dates you mentioned was my great grandmother. I thought her maiden name was Stephenson but I could be wrong. Gudrun is buried in the Blaine Cemetary. I am certain we are talking about the same person. I do remember my mom talking about someone named "rose" but that might be someone else. I don't know. Gudrun was married to Louis (lewis?) Byron and they had three sons - Johan (joseph?) Ole Byron, Tryggvi Byron, and Thor H Byron. Johan was my grandfather. I have some old photos from back then but do not know exactly whom everyone is.
Were you able to find any? Do you have the exact info on Rosa and Gudrun's parents or official last name?
These icelantic last names kinda throw me and it seems they changed up the spelling quite often.