Västerbotten kicked off the match and took the lead already after 28 seconds when Evelina Arvidsson came free and nicely faked away the goalkeeper and put 1-0.
Barely ten minutes later came 2-0 to Västerbotten, also from Arvidsson's club.
But before the first period was over, Dalarna had equalized to 2-2 after goals from Emma Hermansson and Tilde Sundnäs Grillfors.
With only two minutes left of regular time, Sundnäs Grillfors struck again.
She poked in a return on a shot from Alva Ullbors and Dalarna took the lead with 3-2.
With 30 seconds left, Dalarna set the final score 4-2 after a new goal by Tilde Sundnäs Grillfors on an assist from Ullbors.
- It feels really nice.
This builds our confidence.
We said we would continue to fight, we work as a team, says Tilde Sundnäs Grillfors after the victory.
Dalarna is now ready for the semifinals against either Småland or Blekinge who will meet in the second quarter final.
Watch today's matches in the TV puck here.