She was played by Pamela Brown.
Miss Nina is the featured villainess femme fatale from one of Peter Vincent's movies, which was on TV while Charley and Amy were making out. In the film, the evil Miss Nina seduces Jonathan, who quickly falls into her seductive spell. At that moment, Miss Nina reveals herself as a vampiress, unaware that Peter Vincent is closing in on her. Just as she is about to insert her fangs into Jonathan's neck, Peter stops her, causing Miss Nina to angrily hiss at him. Miss Nina snarled at Peter, who later chases her with a wooden stake in hand. Though not shown on screen, but definitely heard, Miss Nina was eventurally killed by Peter.