i don't want my MIL in my future baby's life

I cannot fucking stand my mil. She's an uneducated, manipulative, money hungry liar and narcissist. She's spent the first 4 months (and on going) of our marriage making everything about her and her divorce with my fil - getting my husband into it when he had no place to be in there.. and making him constantly depressed and anxious and angry with the drama, lies, and bullshit. She'll then ignore him for a few weeks as if she had no care in the world for him and then turn around and says she loves him and she cares about him - and me. What a crock of shit. He is so hurt by her actions, and it's killing me to see him this way. We recently told my fil that we are pregnant and he went to her to tell her the news because he thought she deserved to know. He said she was crying and crying and the first thing that came out of her mouth afterwards was exactly: "nothing is going to stop me from seeing my grandchild" I THINK NOT ☝🏽 I'm not going to stand that my child will possibly be ignored, neglected, lied to, and put into drama and bullshit throughout his whole life by his OWN GRANDMOTHER for one fucking second because she feels entitled to being in it. She's a toxic person to me and I don't want anything to do with her anymore. My husband feels mostly the same. Honestly, am I being too harsh? What can I do? She will literally go to the ends of the earth to fight my wishes. And I just can't have it. Absolutely not. I want to act now if I can before it's too late.