The midfielder, who was left out of the England squad for their Euros triumph last summer, set Arsenal on their way to victory after being handed a rare start at Emirates Stadium.
Lina Hurtig then scored twice as the Gunners backed up their impressive 5-1 win over holders Lyon last week to take control of Group C.
“This game really came at a moment where we needed to trust the whole squad,” said Arsenal manager Jonas Eidevall.
“It’s nice. It’s the Champions League, so everything is at stake, and I hope the players feel that and that we trust them.
“When you put players on in a Champions League game it’s because you trust them. I’ve been really happy with how people have been training and how the spirit has been.”