It might have been sort of interesting if Vicky had wandered up to David's room and said to him, "Tell me again why you're so frightened of Barnabas." Would it have brought any of her hypnotically-instilled fears closer to the surface?
Previously when I've watched these episodes, I've assumed that Julia's motive in hypnotizing Vicky was jealousy. Now I'm changing my mind. I think she's just trying to contain the situation. She can't bring herself to destroy Barnabas, for several reasons, but she's got to try to keep him from harming more people. Barnabas commented the other day that he knew she wouldn't destroy him because he had seen the effect upon her of the murder of Dr. Woodard. That should have told him that he needed to eliminate her once he had decided against a cure, but he keeps thinking he can control her even without biting her.