Passenger Lists

This was a VERY helpful site in finding my ancestors. Now, I am looking for help in finding the ships they sailed over to America on. I found my grandfather, Hans H Thorsnes, in the Ellis site but cannot find my grandmother, Anna Ragnhild Sandhaug. I know my grandfather was her second husband. Her prior relationship was with a Carlson/sen(?). I don't know what last name she would have traveled under or where she actually landed. Again, your assistance is deeply appreciated. Thank you. Erika Thorsnes