Elizabeth, being an energetic teenager, became very bored while her husband was off at war.
And since she was an evil genius, she began to pursue and develop her interests, one of them being withcraft. Elizabeth surrounded herself with witches, alchemists, and people who claimed to be in league with the devil.
She was also highly sexual, seeing many young men while her husband was gone and even frequenting her bisexual aunt. And it just so happened that both her and her aunt were very sadistic, and so Elizabeth, who was already cruel to her servants, learned new punishments from her aunt.