Hi Brandy and welcome to SR. I agree that you have to "try" to focus on your recovery and just put a wall between you and that negative energy. Whether your Mother in Law comes around will be her problem.
Put her out of your mind and concentrate on yourself and your recovery. She will see the change. I do know about the mother in law and daughter in law relationship, but won't bore you with my story. You are the important person here. Your son is important too and then of course, your husband.
You can do it sweetie. We are here for you and we DO understand!