Probably if Taís were a good person she'd be on the streets of Westcrown right now. A good person would be willing to risk her life to fight back the diabolists, just like the priestess said. But Taís isn't brave like that, isn't willing to risk her life for it, finds it hard to stomach the idea of stringing someone up on a lamppost even if it's the right thing to do.
As the mob takes to the streets of Westcrown, she's hiding in her room at the inn and praying.