RAGNHILD OLSDATTER

I have just learnt my great grandmother, Marit Olsdatter Rui, born 1835 in Gudbrandsdalen, Oppland, Vaga parish, Norway, daughter of Ole Olsen and Pernille Christensdatter, had a sister, Ragnhild, who immigrated to America. Ragnhild married a Nelson, but I don't know if that was in Norway or America. I have no other information on her. I would like to learn more. Any help? Sure appreciate it. Thanks! JJ Email: [email hidden]