The Dutch star Lieke Martens got the ball to the left and recorded to Rolfö who surely put the ball in.
The national team Swede's first Champions League goal in the Spanish club.
Rolfö was then replaced in the 71st minute in favor of Nigerian Asisat Oshoala.
2-0 came in the 95th minute when Jenifer Hermoso put in a penalty.
Barcelona has started the Champions League with two straight victories, while the Danish league leader Köge has two straight losses.