"If I'm stronger than this, then why can't I protect everyone?! I vowed to protect peoples' dreams and it seems more and more like a silly fantasy!" Cure Nightmare burst out in frustration.

"This world needs fixing. Everyone here needs fixing and I'm going to do it!" she snapped. "If I can't do it through smiles, I do it by force!"

The fact that she turned into something of a panic seems like what Twilight said hit a nerve.