Mr moose, I believe this situation has been going on for some time. I have read your previous threads about this situation.

Last time you had said you were getting your youngest out of their because of the physical abuse she was suffering.

You need to listen. I know you feel like your wife has all the control, and can manipulate EVERYONE into seeing things her way but she can't.
That is her conditioning speaking.
If she is physically abusing your child, you wait til she goes out, you shove some stuff in a rucksack and you take your daughter and get out. Chuck your cell so she can't reach you, and go to the last place she would look, or someone you think you could trust.

I would have thought her parents must see something isn't right.

Don't tell me it can't be done,because I did it, with 4 kids, not one. And I had no one and no place but a friends to go to to start with. But it have me a safe place for a few days to work from.
Your daughters are wrecks because no one is protecting them.
And all they have is you. Your going to have to dig deep and find the help. It isn't going to come to you.

Take care.