What do you mean with second or third? She is a Vik, her baptism Nov. 16th 1749, page 728, second from the top: https://www.digitalarkivet.no/kb20070831610557
Here is her engagement for her 1st marriage with Knud Jørgensen Brunstad dated October 24th 1773, on top of the page: https://www.digitalarkivet.no/kb20070831620063 and here is their marriage dated June 26th 1774, on top of the page: https://www.digitalarkivet.no/kb20070831620069 ("Prædicta die" means "the same day" and the date is written at the bottom on the page before.
Here is the baptism of Knud Jørgensen Brunstad dated February 15th 1750, line 7 on page 736: https://www.digitalarkivet.no/kb20070831610561
And here is the burial of Knud Jørgensen Brunstad dated June 8th 1788, page 304: https://www.digitalarkivet.no/kb20070831620167
Here is Marte's engangement for her 2nd marrige with Carl Rasmussen Brunstad dated Dec. 31st 1788, page 313 5th line from the bottom: https://www.digitalarkivet.no/kb20070831620171 and here is their marriage dated January 25th 1789, page 314: https://www.digitalarkivet.no/kb20070831620172
Carl Rasmussen gets his rentalagreement (bygsel) from provstinde sal. Tønders on a part of the farm Brunstad November 25th 1788, no. 22, page 107b: https://www.digitalarkivet.no/rg20090420380108 That is why he uses the farmname Brunstad when he gets married. He is not born there.
Marte Knutsdatter's burial November 3rd 1816, page 111: https://www.digitalarkivet.no/kb20070831620502
Carl Rasmussens's burial, no. 4 1823, page 206: https://www.digitalarkivet.no/kb20070831620628