This is a rather... awkward development. Compared to the LN, the manga seems to have shorten the pacing of Nacht and Aisha's conflict. It's normal for LN and manga having different pacing, but I think this type of moments shouldn't be shorten.
In the LN, it was only after Nacht had repeatedly warned Aisha 3 times, and when Aisha still refused to let go of the past, she finally snapped. But even then she didn't immediately abandoned her that, instead she promised she would expose the truth, and if Aisha still insist to cling to the fake, only then she will abandon her.
... And Nacht quickly regretted using harsh words on Aisha once she was far away enough.Then she got herself a slave(not)
... And Nacht quickly regretted using harsh words on Aisha once she was far away enough.
