Christie Louisa Mattis - b. abt1814 - Norway

I am posting this as a new search even though she got included in earliers posts. Since then, I have sorted out loose ends and verified documentation and do not want the previous information to misslead anyone. Christie Louisa Mattis married a "Peter Ondell" in Whitewater, Walworth County, Wisconsin on April 18,1851. After examining the original document that had hand writting/legibility questions, I determined the date was correct since that was within the period the minister was active. Peter's last name was probably changed from the traditional Norwegian at that time. She apparently had 4 children between 1851 and 1857, but no birth records are available for that area (Milwaukee and Walworth Co.) at that time. One is my g-grandmother. The local genealogists in the area have said that birth and death records were very rare at that time, but the ministers usually kept good marriage records. The local Walworth County church christening records do not exist now. The area was very recently settled and church services were held in homes. There is no verified record of where or if 2 of the children were born in Milwaukee. A subsequent 1860 U.S. census with naming/spelling/legibity inaccuraies list her as born about 1814 in Norway. Using the LDS site, I found a Lovise Matiasen, christened July 11, 1814 in Forde, Sogn og Fjordane, and her apparent parents. (Matias Johanssen Kleppe and Anna Susanne Madsdatter - recently corrected 11/12/2008). I am trying verify if this is my Christie Louisa Mattis. I have not found any other records on immigration prior to 1851 or any information on her existance in Norway after her birth in about 1814. The man she married in 1851 immigrated before 1850 and I also do not have any information on the actual date because of the variations in the U.S. Census dates. She was last listed in the 1860 U.S. Census as "Chastain Ollendorf". She was never documented after that and Peter married again in 1869. - She may have died or returned to Norway as some of my other ancestors did for a period. I appreciate any help or direction. I can fumble through the old Norwegian script on documents, but if the index is not digitized/indexed, I seem to get no where unless it jumps out at me. I thank you in advance. Richard Schumacher