There was no way you caused that horse to learn a bad habit in only a few minutes. The horse was obviously agitated before you mounted. Even if she is deranged and really thinks you caused the horse to start rolling with your animal telepathy, a good instructor doesn't scold a student for doing something wrong. A good instructor teaches you what to do in the future, not blame you for messing up the horse. Don't give this woman any more of your hard earned money.