Run away, now.
take something to write with, food and water and maybe your plushies but you don't need as much as you think, just get out, go, either you'll die or stumble upon better circumstances somehow and believe it or not, both are preferable to how you'll end up otherwise. You may end up in a worse situation but you can try to improve it, you'll still be better off being away from her. Get away from mom as soon as possible and stay away to the best of your ability, she will make it extremely difficult, not because she loves you but because she NEEDS to control you, keep you small and self-loathing. Trust your intuition, do not trust a word she says, get and stay away at all costs.