Smilla Holmberg thus scored her first two goals for Arsenal after moving from Hammarby last autumn. The full-back was moved up the pitch and played as a right winger with good results.
Blackstenius only played in the first half before being substituted - but still managed to score two goals.
Arsenal won 2-1 in the first leg of their Champions League semi-final against Lyon on Sunday and made five changes to the starting eleven from that match.
The victory lifted Arsenal into third place in the Super League, eight points behind leaders Manchester City but with two games in hand. Second-placed Chelsea are just two points behind.
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