There used to be a way to win using hypnosis. It was easier with horns. Now, you can still use hypnosis, but you need horns.
The other two ways to beat 0-3 don't need you to be a sheep-girl. I didn't think it would be a problem to remove the no-horns hypnosis, it was done to be the same as the ropegag scenario and to steer people towards getting the new shrine 'ending'.