I think you are doing all of the right things. I think you might want to consider therapy. You do not want this child with this much anger to continue on this path.
So, get her into therapy where she does not feel threatened. Peace.
Ok I think your husband needs to spend some special time together like maybe a daughter and daddy day they go to a movie and dinner or do something she likes to do, it sounds like she is jealous a little that she is not getting all of her dads attention, you definetly need to fix this before the baby comes. He should really start making time to go do things with her alone, and you should also make sure all 3 of you are doing positive things together. The fact that you said she takes your things and destroys them makes me think she resents you.
So after her dad and her spend quality time together and she is reassured shes his number 1 little girl, I think it would be positive for you and her to try and do something positive together too, like maybe you make cupcakes and she helps you, you let her decorate them and lick the bowl have fun with her. Let her see you love her too because I am afraid with all the negative things shes doing and negative attetion shes getting back from you she doesn't feel very loved and she needs to know that you won't tolerate that behavior but that you will always love her no matter what ( even if you wish you could send her away sometimes). Most important patience!
And keep disciplining her, im sure she is testing you too. Sorry I should be more specific when I talk about disciplining, her dad should be doing most it if not all of it because you don't want her thinking that he is only yelling because of you or something you may have said and making her resent you more. And the most important thing don't ever let her hear you all talking about her or this problem!
Make sure she is not in earshot.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.