Looking for info on GG-Grandmother Marit Mitmoen(J

Hi, I am looking fo any information one might be able to give me on my GG-Grandmother Marit Mitmoen(Jacobson). She was born in Norway and her parents names were Jacob merteir and Martha Meetmer. She married Christoffer Mortenson in the US. He is originally from Hamar Stift, Norway .I have info on him (any new info would be welcomed) but would like to know where she came from, also other siblings she might have had ....any help would be appreciated. I am trying to gather information before a reunion in August 06. Thanks