Emigration puzzle

I have searched without success to verify when my great grandmother left Norway. According to US census information she provided to the recorder, she arrived in 1884. Most likely she would have sailed from Trondheim, but I do not find her listed in the Trondheim emigration protocol. Her birth name was Kari Olsdatter Lund, born 28 Oct 1839 at Horg, Støren, Sør-Trøndelag, Norway. When her mother married, Kari's farm name changed to Helgemo until she married Peder Andersen Refseth in 1861, but was widowed in 1865 after they had 2 sons, Anders Pedersen Aune (also seen as Refseth) & Erik Pedersen Refseth. Prior to her departure, Kari spent her years in Norway working as a tjenestepige (servant) on area farms, among them Refseth, Aune and Haugen before emigrating to Minnesota to join her 2 sons who emigrated a couple of years before her. Her son, Erik Pedersen Refseth emigrated from Trondheim 12 April 1882 and son Anders followed 1 Nov 1882. If the year 1884 is correct for her departure from Norway, she would have been about 45 years old. She is in Minnesota in 1885 as her marriage to Ole Pedersen, also a Norwegian immigrant, occurred in Brainerd on 21 June 1885. I do not know if Kari and Ole knew each other in Norway or if they traveled together. I don't find an Ole Pedersen leaving Trondheim in 1882-84. There has never been any mention to me among family members that Kari and Ole traveled together. I do not know the farm Ole would have been living at prior to leaving Norway. According to census data, Ole is said to have immigrated into USA in 1882, but I find no Ole Pedersen in the Trondheim protocol leaving Norway that year. Since I have not located Kari’s departure in the Trondheim emigration protocol (who went by Carrie Anderson in Minnesota before marrying Ole Pedersen), and have not found her entering the USA, I’m not sure where to look next. Any help or tips to help solve this matter will be greatly appreciated. Thank you in advance! Pete Riverton, MN