I don’t really see Celia joining in on tattle games tbh. But I do see Alice not being allowed to drinks with Piers there.Well, either that (would fit with Ella's comment) or mother and daughter want to play games with us given that we are speculating about Alice's grifting attempts
Ellas comment was in caps so it is sarcasm to me. Ella is likely having to support Alice while she cries over something Celia has done, enraging Ella and sending that message.