Ok, that's that. It seems the game DID NOT COUNT visting nightwitch IF you disagreed to give her a favor which every sane person would do, who doesn't want to be in debt in some powerful creature. Hmmpf...
All I assumed that in previous playthroughts all you have to do is talk with "both" witches about mindcontrol NOT AGREE with both to their deals.
It's really not intuitive. I thought, "Oh, daywitch agreed to help me so I don't NEED the help of the 'other' one", well, apparently not...
Thanks. You helped me a great deal.