Jenny mathilde Johansdatter

I`m trying to find some information about Jenny Mathilde Johansdatter. She was born in Vefsn, Nothern Norway 28. February 1884. Farmname i s Greva. I can`t find her on any passenger list and I don`t know when she left. She got married some where in hte USA with a man from Italy. Her brother, Nels Greva, died in Calefornia i 1973. Another brother called Peter Johnson died also in Calefornia in 1979. She had a halv-sister called Berit Maria Johansdatter, married to Per Nilsen Kulstad, they went in 1866 (he) and 1867(she). I can`t find them either. They had a daugther called Marie Lovise born in 1863 og 1864. Can someone help me to find information about them??