Clara Berg

I am looking for information on Clara Berg from Norway. Don't know where in Norway. I believe she was born 11 Jun 1861 to Berren Berg and Isabelle. She has a brother Andrew born in 1853 and another brother Peter(no date). The census reports in the U.S. have given me 3 different dates she came to American. 1872, 1880 and 1881. She came to the LaCrosse are in Wisconsin and then moved to Barron, Wisconsin. She married John A. Anderson in 1884. I hope someone can point me in the right direction.