Miedema's goal helped the women's team to a draw at the other side of the world.
The forward had not scored in seven matches.
Lineth Beerensteyn had opened the scoring for the Bianconeri with a run on the counter-attack before scoring.
Miedema's 61st-minute headed from Maanum's corner was the only goal of the game.
At the top of Group C, there is a seven point gap between the second and third place teams, as well as a four point difference between the first and second place teams.
After a 14-game winning streak in the WSL was ended by Manchester United on Saturday, the team did not seem to be lacking in confidence.
They dominated first-half proceedings and Stina Blackstenius twice went agonisingly close to an opener, firing over from Maanum's flick and then hitting it straight at the goalkeeper.
The only noteworthy chance of the opening 45 minutes came on the stroke of half-time, but Arianna Caruso's powerful headed from Barbara Bonansea's cross lacked direction.
Beerensteyn's penetrating run in the 52nd minute was enough to break the stalemate and, although Miedema's leveller came just nine minutes later,Arsenal failed to find a moment of magic.
Peyraud-Magnin denied her former club as she palmed away the first attempt and closed down the second one.
Despite United putting the first dent in their record this season, the Gunners will probably have been more disappointed to see their talismanic forward go off in tears at the end of the game.
The news that Mead has suffered an injury that will keep him out of action for a long time will make the disappointment even worse.
Kim Little and Rafaelle Souza were not included in the squad that traveled to Torino.
Blackstenius was energetic in the first half but lacked a cutting edge and will hope that Miedema can now propel herself into the form that has seen her become the club's all-time leading scorer.
He only returned from a leave of absence in time to play against United.
The two teams will meet again in December.
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