Carrie, you're just too kind and then your 99 took the opportunity to hurt you and your family. I hope that your husband has seen and has understood the real face of his mother.
Now I think you may try your best to avoid seeing or talking to her. She doesn't deserve to have a good daughter-in-law like you and your cuty baby. Let her stay alone in complete silence so that she may reflex what she has done to you ....
Be brave and take good care of yourself! Your baby needs your care and you must have good health to acheive it well!