Have you found her and William in the 1900 census, and where were they living? - Okay, answered my own question, they were in Milwaukee. Tillie is transcribed as Marie. I think that Joseph was actually born in Michigan, look at this record herehttps://familysearch.org/pal:/MM9.1.1/NQXH-V3X
Also, it looks like Tillie had three children, and one died, according to the 1900 census.
I think I found Lars Larsen Breum in the Norwegian census in 1875, but no one with that family that looks like Tillie, of course she could be a cousin.
Not sure any of this helps yet, just some information I have gathered! I will keep looking.