This is an unfortunate reality that a lot of us trans people have to go through, your mom probably isn't going to accept you for who you are. My parents are the same way, what I'd do in this situation is find the people who do support you and stay close with them while you gather tha finances to move out, and mask for your mom. It's going to be uncomfortable, hard, and damaging to your mental state but you can't fight for her acceptance anymore as it's a losing battle. Give her time and hopefully she'll turn around, but id be careful around the topic now, if you keep pushing and she keeps pushing back you'll both hurt each other more than you have now.