Well, offer her services/obedience. It can have sexual undertones (like she rolls on her back and spread her legs invitingly or so). Assume item used is 'dog whistle of submission'. Albeit primary effect is to lure dogs and be friendly for you (albeit with hellhounds or other powerful canines the effect rapidly wears off once they arrive). Ofc I leave it as mystery plot device implented later where is explained how Juno has such whistle in first place.