Mental Harrassment

My sister in law has been harassing me and my family by creating unnecessary nuisance and giving unnecessary blame on us including my brother. She does no household chores at all and instead orders my brother to do so. She has been threatening us that she will commit suicide since the time she got pregnant. Prior to her delivery she had eng numbers of fights with my brother and my parents stating we are uncultured and uneducated. My brother is her second husband she is already a divorced women and we particularly do not know the reason of her previous divorce. She tried to abort her baby during her last trimester (9month) and called upon her doctor for abortion to which she denied and discontinued her check up. Her delivery charged were paid by us and it turned out that she has become more rebellious and has started fasting until she leaves our house. She refuses to giver her child in my parents hand but unfortunately she is unable to manage her child by herself. She is not able to take proper care of the child and shows tantrums over taking care of the child neither she is giving the child to my parents because she stays very well in my parents hand. My brother and my family is extremely traumatized by such behaviour of her and we are afraid that the child will not stay alive in her hands. She is now waiting to complete her 11 days post delivery and now is stating I will leave the house. She is not allowing us to go near the child. I badly need a help.