Couple of things I wanted to say, but have to get to work, so I am short of time.
Brue is so right - you'll know when it's time to do it. . You will know when you have had enough. In the meantime I admire your stance.
The hostility your wife shows will cease. Whilst my wife can sometimes still be angry, it is no longer my fault, it appears to be everything else in her life. At this stage it is not helping our relationship, but at least she now sees it is not all me.
I have noticed that with a number of people I have talk to off the board and I see it in my wife. That they look to their favourite offspring as a friend, confidant, and mate, rather than as a parent.
This again will pass, your daughter, as with many of the people I have spoken to, will gradually realise that do not want another friend, they already have plenty of those, they want a mother. But at the moment, until your daughter realises this, she will milk the situation.
Also, many times, I have heard my kids speak, and I think this is not their words, but their mothers. I have learned to let it go and shrug it off. It is hard, but when our kids want and need us, they will come to us.
I think we need to let our children grow and learn, just as we need to let our spouses grow and learn.
Your wife and daughter, just as my wife and daughter, appear to be at the same developmental stage. A nightmare in your and my households, but we have been strong enough to put up with it thus far.
Trouble is we are both in the same line of work, and have over analytical minds. I think this works against us when dealing with MLC.