You may not believe this, but your mother is afraid here.
She is afraid that when your DD goes to nursery, you will be out of her clutches. You will meet other mums. You will be able to talk to the nursery workers about your DD. You will be able to see what a solid mum you are, doing a good job with your DD. You will gain confidence. Your mother is afraid that she will lose her hold over you when that happens.
You need to call Women's Aid.
0808 2000 247.
They are usually unable to take a call immediately, You will be directed to voice mail. Leave a number where they can contact you, and a time that is good for you. Give a brief message about your situation.
If they cannot help you, ask for a number for some agency that can.
While this is not the usual scenario in domestic abuse, you are definitely being abused.
Your mother has no rights here at all. Please try to remember that.
She has abused you to the point where you think you have no options and no rights and you feel weak and helpless against her, but you do have several options here, and believe it or not, there is light at the end of this tunnel you are in. There are people and agencies who can help. You could, for instance, take out a protection order against her, through the courts. You will need help and support to do this.
You probably feel that calling the Police when she is making a public nuisance of herself outside your door would result in a terrible consequence for you, and maybe you are not ready to conquer that fear yet, but maybe get your ducks in a line, make sure your home is clean and tidy, DD's bed or cot is clean and safe and comfortable, DD has a chest of drawers or some other clothes storage with clean clothes in it, there is decent food in, some little toys, books, cuddly animals visible... No obvious red flags like empty bottles, evidence of drugs, mould, empty fridge, nappies lying around, medicines left where DD can reach them, and any other hazards you can think of. Then even if your mother succeeds in making the police or SS think she is concerned for your DD's welfare, they will see that she is lying.
Then when you know she doesn't have a leg to stand on, and she plays into your hands, make that call.
Please keep posting here for support.