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I'm glad that you got a restraining order on her. Addicts can be very unpredictable and add to it an element of emotional instability and possible mental illness and there are the makings of a potential disaster. I suspect that she was just spewing words to hurt and anger you and/or your father but I'm glad you didn't take any chances.
I hope you stick around and learn and share. There is no doubt that the rooms of Alanon and Naranon (and a good therapist) have helped me shed some of the anger, resentment, and anxiety that comes will loving or living with an addict in the family.
gentle hugs