possible wrong surname on list

It is possible that my great grandmother Karen Olesd had the wrong surname on the list. I know she came in 1871 from Lier to Alpena Co, Michigan. She joined a bother who had been in the USA since 1867 and her parents and 3 other siblings joined them in 1872 On the Digitalarkievet site I find a Karen Hans, age 23 Domicile Lier, Destnation Port Huron, Michigan. She left Kristiana on the ship Hero from the Gunnestad & Co. Line. They departed 1 Sept 1871. My cousins mom just told me that Karen told the first real thing that happened in America at that that time that she always talked about was the big fire in Chicago and that started onthe 8th of Oct 1871 in the O'Leary;s's barn. That probably happened right fter she arrived in Alpena. She also talked about smoke in the Alpena area. She thought it had drifted to Michigan from Chicago, but my cousin also said that there was some forest fires around Alpena Co at the same time. There aren't any other females with name Karen that would have come about this time (1871). Is it possible that this Karen Hans is really my Karen Olesd???? The age matches what she would have been in1971, 23 years old. She did not marry until 1879 in Alpena her husband was Martin Olesen, same last name, different family. thanks Karen Jenter Michigan