Jack - I have been lurking from the start on this and your other thread. You're in a horrible situation, and to be honest, I can't see it improving in the short term. Your wife, no matter what she says, doesn't want to take responsibility for her behaviour, and you are too scared of the consequences to make a stand (understandably).
Is your wife a selfish woman in other areas of her/your life/lives? Because to me, she appears to be wallowing in self-pity and a bit me, me, me. I accept that she has depression, but that is no excuse for playing these stupid games in the name of making herself feel better and with the result of making you feel 100% worse.
I understand that you don't want to split up over this, but is there any way that either of you (preferably her) could move out for a short amount of time (maybe a couple of weeks?) to bring her to her senses? Perhaps she could stay with friends or relatives? I really think she needs something like that to make her understand just what she is on the edge of losing.