The fastest way to lose a slave is torture, even when feeding regularly. They just don't break. There's a documented behavioral pattern for long term captives that might help you out. The initials are S.S. Hope that helps you out.
As for the M.A.I.D. quest chain, I haven't delved into that recently.
I was Able to get out finally after (Tampering with the stats) and feeding her, the point is of course you have to lower Inhibition, Make Corruption very high, in short try to see which stats drop with torture, tamper them from the Debug and then just feed her, the more you Feed, the more she will Trust you.
As for the M.A.I.D clubi was gettting quite angry but in the end the third Time Ameli talked to me in a Maid Costume she opened the club and i was able to get them to the V.I.P room, so more income.
I was wondering if i should fire Karin Hardman since she doesn't contribute in any way to the school other than draining my income of 4k, i also passed the request to make Student independent in the Ward so maybe it turns out well?