First...she needs to make sure she has what the kids and her need to stay safe. Have her pack a few overnight bags and give them to you to hold. Any important paperwork she might need. If she is unwilling to call the cops on this abusive person then she needs to wait until her next break from him and leave. They will help provide her with a shelter designed for this type of situation. Have her call DAWN (Domestic Abuse Womens Network) They specialize in helping ppl in abusive relationships get help from the courts. help with housing and food, etc. Its the place to start.
Call 211 and they have all the information you need to help them
Have her go there and they will help her
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