Berthe Paulsdtr. Avlund (Berthe Olsen) 1811-1879

I am looking after Berthe Paulsdatter Avlund (Born Helleberg, married 1 Berge, married 2 Avlund). Berthe was my great great grandmother. Berthe was born in 1811, and she emigrated to America from Gausdal, Norway in 1879. Berthe, her husband Ole Avlund born 1812, and their son Christian, born 1852, arrived to New York with the steamship Baltic, June 6th in 1879. (Ancestry.com). In the passangerlist at Baltic, Berthe's name was written Birtha Aflund. After this I am not sure how their life went, except of that Berthe probably died the same year (1879). I have seen names that might look like this family in a book from Mt Morris Holden Lutheran Church in Wautoma, Wisconsin, the last name was then maybe changed from Avlund/Aflund to Olsen, but there might be somebody else with the same names? Two of Berthe and Oles sons; Hans, born 1841, and Torger, born 1850, had emigrated earlier. Dose anybody know something about this family and descendens? I would be so happy to receive some more information! Regards, Mari Sylte Ringstad, Brøttum, Norway