Stepfather is listed on 1st marriage even and the census prior to marriage she is a servant with no relatives so I have no idea where to look. I also cant understand Norwegian at all and my last bilingual relative died in 2014.Not sure if this helps but She moved to her 1st husband Niels Andersson farm Mønnes and continued living there after her second marriage to Rasmus Joensen. here is her in the cenus after 2nd marriage http://digitalarkivet.arkivverket.no/en-gb/ft/person/pf01058456003916 edited added links to census in case that helps.
1801 census for 1721P Verdal
Marit Olsdatter
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Mr s t
Try the forum at Digitalarkivet I got fast answers see link when I asked about Veile-2... I think you can write in english 99% of the people in the Nordic are at least bilingual...
Wild guess Mønnesslekta, samlet av Ragnar Heimdal og trykket av Sentrum Trykkeri i Trondheim 1978 they speak about a book from Mønnes I dont know anything about Mønnes but maybe it can be useful
See same book at Google books and at http://slekt1.com
FB https://www.facebook.com/groups/NorwegianGenealogy/