Martha F. Vanborg (1857-1916) and her parents?

Dear Listers! I have been struggling with this family for many years. There may be no direct descendants, but details are missing which might clear this: Martine Anna aka Martha F. Vanborg was born illegitimately in LaSalle Co., IL June 17, 1857 and christened at the Perry Lutheran church in Dane Co., WI. Her parents were Anna Monsdotter Urness, born in Hafslo, Norway Feb. 5, 1832 and one Fredrik Vanborg about whom I have no information at all! In 1890 Martha Vanborg got a patent to a farm in the very Northwestern township in Grand Forks Co., ND, and in 1896 she got a similar patent to a farm in Spruce Grove township, Becker Co., MN where she lived in 1900! The mother Anna Monsdotter Urness was married in Dane Co., WI Feb. 7, 1864 to Johannes Torstenson Barsness aka John Thompson from Sogndal, Norway (1827-1906). John and Anna farmed in Blue Mounds township, Dane Co., WI, but separated in 1884 and then sold the farm! John moved in with relatives in Naples township, Buffalo Co., WI, while Anna apparently accompanied daughter Martha to Grand Forks Co., ND and later to Becker Co., MN. But in 1901 Martha sold her farm in Becker Co., MN, and I see nothing neither of her nor of her mother Anna until Martha Vanborg died in Coeur d'Alene, ID on June 22, 1916. Her estate was probated, and according to the Probate court in Kootenai Co., ID the record includes 113 pages, which I have not seen! Challenges: ** Where did Martha and her mother Anna move in 1901? ** Date and place of Anna's death? ** Can they be found in the 1910 census? ** Who was Fredrik Vanborg? ** In 1900 Anna Thompson is said to be mother of 2 children, but only Martha Vanborg was alive. Any explanation of this? In 1880 Anna and John did have a fosterson John Olson, aged 9, living with them. Could that be the deceased child? Thanks a million in advance for any assistancxe you can me to solve this family mystery! Very sincerely yours,