She is legally responsible for you until you are 18. Shes only responsible for YOU, now if you were getting married, she would have to agree and sign papers, if you are under 18, but when it comes to your child, NO ONE can decide what you do. You can keep your child, don’t worry ok? Just don’t worry about it right now, and go on with a healthy pregnancy and once the baby comes, I’m sure she’ll change her mind, afterall, she’s seeing her grandchild, and all the joys, then she would be begging you for forgiveness for what she said. Good luck hun 😉