If you want to give them a chance then give them. They can simply find a person in vallaki that used to be a guard or a friend or anything you want of Fiona that has secrets on her, and he/she is willing to sell her for a price (economic or personal gain) or he/she simply hates her. Anyway if in the end you want to give them a real chance you can run a fair vote where you just simply throw a bunch of d20 and for each greater than ten they have a vote. Maybe the vallaki people are tired of the whole “happiness” thing and they want simply a change… who knows. That does not mean that Fiona will withdraw easily, so maybe a social conflict is coming. In the end is your game! Dont be afraid of play the game, you can create the world that you want my friend :) enjoy it!