Maternal Grandmother's Birth Record

Hi All! It's been a while since I've written, as I have been still trying to locate (Anna Ruud, nee: Wamnes) my maternal grandmother's birth record. Her birth date again is: 06 JUL 1884, born in Kristiania (Oslo). Her parents: Anton Olsen Wamnes-1848 / Annette Gundersen-1851. According to the 1900 Norwegian Census she was living at: Uranienborg Terrasse 2, Kristiania at the time. So, I wrote to quite a few of the churches in Oslo and they said according to her address at that time, her church would be the Uranienborg Menight Kirke in Oslo. I received a reply from them stating that their records of the year of my grandmother's birth in 1884 would be at the National Archives Riksarkivet, and I should contact them which I did, and got absolutely nowhere with them. They were not helpful at all. So, now I am back to square one. My mother in America, did get the Latter Day Saints film number at her library from the Uranienborg Menight Kirke, but can't seem to find her record on there either. We are really at a brick wall, and don't know where to go from here. My Grandmother's parents were born in Skiptvet, as well as their first 3 children: Ole-1871, Gunder-1873, & Nils-1875. After the first three children, they left for Kristiania, because the remaining 4 children they had were born in Kristiania. They were: Jakcob-1882, Anna (my grandmother)1884, Bertha-1887, and finally Inga-1890. We are also having a difficult time locating my grandmother's parent's death dates. I was told Anna's mother Annette died in 1890, a short time after she had Inga, when Anna was only 6 yrs. old. (Don't really know how reliable that bit of information is though). We also can't seem to find Anton Olsen Wamnes's death date. My mother and I are assuming both died in the Kristiania area. We seem to have found the other siblings birth and death dates in my grandmother's family, but are unlucky in finding Anna's parent's death records and Anna's birth record. We do have Anna's parent's birth records and Anna's death info. If there is anyone who can help us locate these records, it would be most appreciated. Regards, Cockatiel [:)]