Grethe Bolette Pettersdatter Hunn

I am trying to find some information about this woman, who is my great-grandmother's sister. Her birth date is 21 April 1859, and she was born in Hunn, Borge, Ostfold, Norway. I have been searching Ancestry.com for these answers, and I just get more and more confused. It appears that she married a man named Anders Larsen Humlekjaer. It also seems that she married a man named John A. Dahl and immigrated to America. Both records indicate that she died in Wisconsin, USA. My purpose for looking is to build my family tree, but also to see if I can find relatives who live here in the US who I did not know I had. According to Ancestry.com, she had three children with Dahl, and I'm thinking she may have married twice and immigrated to America after her second marriage, but I'm just purely guessing. I'd appreciate knowing anything that anyone might know about her. Thank you!