This is difficult and there is no way around that. To echo other comments - detach. It has been helpful for me to think of detaching like this - you still care, you want her to be okay, you don't like seeing her like this, BUT if she is mad, if she says mean things, you are not affected much by it because you know who you are regardless of what she says or thinks.
We can all tell from your posts that you are a good dad, you are sensitive and caring, you don't want to hurt others, in fact you want to help others. You aren't forcing this. So, if W says something different than that you can let it roll off you becuase you know the real you. Also, make sure you always behave like the real you.
