Ochako frowns. No, of course she's not a sheep, but she's friends with her classmates, and they operate as a team. They communicate, they support and help each other, and they all work together to make sure they all can live easily. And her decision will effect them, regardless of their current involvement. Besides--

"Why me?" It's been nagging at the back of her mind ever since Shigaraki started literally following her. "Why's my decision so important?"

If he think it's because the 'nicest' one, he's sorely mistaken. Ochako is certainly kinda, and she's sincere in her kindness, but she most certainly knows when to bite back. She's hung around Bakugou long enough to know the place and time to show her claws and fangs, and use them. She won't be manipulated by him into making some shitty agreement he'll just break eventually.