1- It's totally obvious what is about to happen and the so called head of the Druids is only escalating the issue when she could easily diffuse it.

2 - Locking up a child for theft is not condusive to a good character, at least not in my view. Lawful/Good in a medievel setting, yeah mayyyybe, it's why I prefaced it with Chaotic good, as in Good but with my own slant on rules and either way it doesn't take away the design choice to not allow your character to intervene, even if it's a bad idea? If I think that snake needs killing before something potentially goes wrong, that's a roll I want to make and one that directly impacts my choices.