Brynhild Johnsdatter, Rennebu, Ellevsen

In reviewing the 1865 Norway Census-for 1711 Meraker (Øvre Stjørdal prestegjeld) yesterday for my G-G-Grandfather, Mikkel Olson, I noticed something I missed previously: His mother is listed as living with him, Brynhild Johnsdatter, born in Rennebu, 76 years old. She is listed as Føderaadskone, which I found was a sort of pensioner, receiving support from the son who has taken over the farm. (Or new owner). I am thrilled to bits, as this generation was previously not known by anyone in the family! I calculated her age at the 1801 Census, and found in 1801-telling for 1636 Meldal someone who is the only person the right age, with the right name: Brynil Jonsdtr. 11, Father Jon Ellevsen 65, Mother Hille Jonsdtr. 54. Farm is Kalvhagen. I find no farms with this exact name, although there are many which begin with "Kalv". Some Church books for this area are online, but are unstructured. I've been through the years I thought she might have been confirmed but didn't find anything. And no idea when or where they may have married or had other children. **My question is, are there any sources online that might help bridge the gap between 1801 and 1865? Or help me prove or disprove whether this person is in fact the right person or just a coincidence? Or will I need to dig into records offline in order to find Brynhild's marriage and other children?** Any pointers would be much appreciated!