I see even the senior servants have conformed to their former mistress's cruelty and are themselves rather cruel overseers. They're even into bullying and hazing of newer staff. But I love their confounded looks when new girl Erin came back very happy and willing to loyally serve her new mistress.
I don't think this is gap moe, but there is certainly a very amusing gap in expectations that is giving me great joy in this story. That moment with new!Jelly headpatting Erin was also very touching.
Or maybe I'm just a sucker for stories that rebuild ex-villains with terrible reputations (within bounds, some are truly beyond redemption) into better people.