Ingeborg Ansteensdtr (1801-1847) Nissedal,Telemark

I'm trying to find the birth record for Ingeborg Ansteensdtr. From the marriage record and death record I believe she was born 1801-1802. I'm guessing her father was Ansteen Terkelsen. The marriage record and the records of her children's birth are from Treungen in Nissedal, Telemark. My stumbling block is that the Nissedal records seem to start 1814. Any suggestions? The records I have for her include: Marriage Record #2 Mar 5, 1821 Birth of child Mari March 16, 1822 Record #5 Birth of child Halvor Apr 3, 1821 Record #10 Birth of child Halvor Juni 4 1823 Record #5 Birth of child Kirsten Aug 28, 1824 Record #8 Birth of child Tarjie Aug 16, 1827 Record #11 Birth of child Ansteen Sept 14, 1829 Record #12 Birth of child Mari June 22, 1833 Record #9 Birth of Child Gunhild Dec 10, 1835 Record #2 Birth of child Marget Nov 27, 1838 Record #1 Move from Telemark to Dypvåg in 1839 Record #3 Death Ingeborg June 18, 1847 Record #20