The Danish midfielder stormed forward on the right wing and fired the shotgun a few meters into the penalty area.
The ball went in an unattainable arc over Sabrina D'Angelo and into the goal.
That meant 3-0 for Rosengård and Troelsgaard's sixth league goal this season.
Before that, she also put 2-0 before the break.
Rosengård eventually won 4-0 and took their third straight victory.
The team has still not lost in the damallsvenskan this year.