| The Prophesy is in the Ministry of Magic, I'd gather she'd know of it's existance. I don't think that she was really that evil, but her devotion to the ministry, and her own thirst for power were probably motivating factors in her control over hogwarts. The truth is, in regards to Snape, McGonnigal, and other teachers, it was hard to find a reason to fire or discipline them. Hagrid and Trelawney, on the other hand, were easy candidates to show her "power" to everyone else.
She's just Crouch, in a small, more compact body. Exercise power as much as possible. Try to prove who's in charge. She really was working the ministries will, and though the ministry was probably influenced by the older Malfoy, I don't she was aware she was doing the dark-lord's will by being there... | |