The Joker is certainly one of the most popular villains of all time, but that doesn’t mean that he’s one of the strongest. He knows some decent hand to hand skills as he’s gone toe to toe with Batman for short periods of time, but Sabrina has telekinesis and her Kadabra at the ready. One good psychic attack would mean game over for Joker since he would not be able to break free of its grasp. At that point, he would have no options left to fight with. Sabrina wins.