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Your mother is a danger to herself and others. Because of her illness, she is not going to accept treatment.
In cases like this, the law allows her to be taken into custody and treated against her will. The next time she does or threatens something dangerous, call the police. They will come out and question her. If she's as out of control as you say, she'll be taken into custody. At that point, she'll get the help that she needs.
This probably seems extreme, but it really the only way to deal with a mentally ill person who is out of control and violent.