Supergirl (1984) is the 4th film in the Superman film series set in the Christopher Reeve universe. This movie sees Supergirl run away from her misdeeds on her home planet and play private school girl on Earth. While you would think this premise combined with witches and warlocks would be box office gold, it didn't quite work out that way.
Also, while Superman is absent from this film, we do get Jimmy Olson, Lucy Lane, and a Superman poster with Christopher Reeve's likeness!