Need information on Karoline Khristiansen b. 1838

Karoline Khristensen b. 11/23/1828, immigrated to the USA, on the Geiser, arriving New York on the 22nd of Aug 1884. She was traveling with her three children: Regina b. June 6, 1867 Oscar b. March 22, 1874 Emil bd unknown, died at the age of 19, on November 27th, 1896 in Eidsvold, Clark County, Wisconsin. Husband's name Karl Khristiansen, immigrated ahead of her, to earn money for the rest of the family to follow. Her son as informant on her death certificate, listed her father as Ole Knudsen. In the USA they used the Christianson spelling of the surname. Her daughter, Regina, on her marriage certificate added Bergh to the last name. Unsure if they came from Oslo, or were living there prior to immigration. Would appreciate assistance in determining where she and her children were born and information on her parents and grandparents also.