Honestly Flavia had the opportunity to become one of the best supportive characters but instead she ends up in the same spiral as the rest of the antagonist, she doesn't need a redemption arc she needs to be killed off; roaches get annoying and if you leave them alive they'll multiply, they can live without their head so just set them all ablaze
Like I said before, burn them alive, make them jump over there flames, make them scream your name for mercy, make them kneel to you, bash their heads in. They deserve nothing but pure, unmanageable, torture give them a fate far worse than death and make sure to show no emotion, joy, remorse, regret, rage, fear, show none of it just to add to their torment
do you remember ThE rAiN