Surname of Alma born in Norway died in Michigan

I’m looking for Alma’s surname and her living descendants. She was born in Norway around the turn of the century 1899-1900. In 1955 she lives in: 151 Garden ave, Manistique, Michigan. I have letters she wrote to my grandma and grandpa, and there she says she have 8 children named Gudrun, Ingrid, Esther, Ellen, Ruth, Sigrid, Rolf and Verner. (She also mentioned some surnames of the married daughters, but I don’t think I can write them here?) She visited us in Norway twice and I have a picture of her and my grandparents. In my childhood we always talked about her as “aunt Alma” – and I thought she was a cousin of my grandma, but after reading her letter I wonder if she was working in my great grandfathers restaurant or being their neighbor or something? If anyone knows her name and her surname – I could find out a lot more about her. Now every seach stops with my missing of the surname.