Acheron has not indicated in any way that she knows what happened to BS or that she mentally beat her up in any way, which is why shes still thinking about her question after they stopped dancing even tho to us the viewer a lot of more relevant shit has happened in between. I like lobotomy kaisen memeing too, but I feel like its important to Acherons character that she doesnt remember much and is probably not exactly a mastermind, at least not in her current state. It could be that some part of Acheron is aware or not but the Acheron we and BS talk to is not.

One thing that I would find interesting to talk about but where I dont like the way the community goes about it is Black Swans emotional state, because she was obviously roughed up by Acherons memories but when she meets Acheron later again with the TB she seems to not be affected almost, but what she does do apparently is plot and scheme against her behind her back.