Time for your husband to tell his Mom all the things the other women have mentioned. The worst part about her visit is that its causing undue stress for you at a time when you should be happy and excited. Don't allow your mother in law to rob you of that.
I remember my sister in law warning me not to let my mother visit when my first was born, She specifically said, all she offers to do is "hold the baby". They ended up with another person to cook for, someone to entertain all week, she just was not any help at all. Reminds me of your mother in law.
Maybe have your husband tell her that your worried those hormones may come back. She should understand that. Pictures, lots of pictures!