So long as we are all on the same sort of length that we are actively all trying to give the prisoner a chance to repent. If the Governor wants her to stand trial, there's no qualms there from Brannor - it isn't his business and that's more merciful than she deserves. If it gets left up to us, and she's even the slightest bit untrustworthy, my vote is for giving her a clean death lest she had the chance to betray Greenest and or inform the enemy by means of escaping.