Lena Olsen/Liv Levorsen Anderson

My great grandmother was born Dec 18/1858 and was married to Ole Anderson(Riulf Olai) on July 1/1881 in Moorehead, Minnesota and died and was buried in Rollag Lutheran Church Cemetery Minnesota from childbirth May 9/1900. I sent for the death record and most of it is not filed out- parents, etc. I saw one document which I think was a Mormon one and it said she was born Sacred Heart Renville, Minnesota. I have tried several places there and can not seem to trace her family. She was known as the "Levorsen" girl and her marriage certificate sdays Cass County Dakota and lists her as Lena Olsen and she is buried with her married last name as Live Anderson? Any idea where I go from here to find her family. No records in family. Brenda Armstrong