The 46-year-old was almost five minutes ahead of OK Kåres Lisa Risby and 5.5 minutes ahead of Stora Tunas Tove Alexandersson when the Dala team finished second and third.
Alexandersson made a strong final distance and lifted from eleventh to third place and took almost five minutes on Nordberg.
Nydalen was third after the first leg and took the lead on the second and then did not let go.
MORE: Here is the start of the youth roll
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See the start of the youth rollout that begins the Tiomila competitions.
Photo: SVT