Looking for Marit Oleson

I am searching for the parents and siblings of my grandmother Marit (Mary) Oleson who was born in 1858 in Norway and had emigrated to USA in 1866 when she was 8 years old. She and my grandfather Peter Lee were married on July 14, 1883 in St. James, Watonwan County, Minnesota. My grandfather Peter Lee had also emigrated from Norway in 1866 when he was 19-20 years old along with his parents, brother and four sisters from Storlien nedre farm in Bæverdalen district of the parish of Lom in Oppland. They sailed on the bark Gustav Adolphe from Bergen May 14 and arrived at Montreal, Quebec on June 16 after ship inspection at Grosse Isle. The family changed their surname from "STORLII" or "STORLIEN" to "LEE" upon entering the USA. The Lee family (my great grandfather Syver Persson Storlii (Lee), my great uncle Torkjell Syversson Storlii (Lee), and my grandfather Per Syversson Storlii (Lee) each filed on homestead land in the Long Lake district of Watonwan County, Minnesota. My grandparents Peter and Mary had seven children, all born at Long Lake in Minnesota between 1885 and 1896. They sold their land in Minnesota and moved to and bought a farm in 7th district of Morgan County, Tennessee sometime between 1896 and 1899 as they show up there on the 1900 USA census. The family (minus my grandmother) next show up on the 1906 Canadian census on a farm near Weldon, Saskatchewan. My grandmother Marit (Mary) had died in 1904, 2 years after arriving in Canada in 1902. She is buried in the Weldon Lutheran Cemetery which is approx. 4.5 miles northwest of Weldon, Saskatchewan. I have been very fortunate in finding both sides of my grandfather's family in Norway (as far back as 1725) but have had no such luck in finding any trace of my grandmother's family. Any help or information would be greatly appreciated.