Looking for Mary Thode

I'm loking for information on my great grandmother, Mary Thode. She married my great grandfather Charles Jacob Anderson, but I don't know the date. I do know that she is from Germany, and came to the United States as a child. Her family owned and operated a general store in Athelstane, Wisconsin. I believe her and my great grandfather lived in Dunbar, Wisconsin. Any information would be helpful. Thank you