I think one of the more important things you have to keep in mind is to be empathetic and not show her anger. Obviously you want to show her your worried, upset, scared, etc, but don't get mad at her. Second, she needs to obviously see a psychiatrist and get on some meds and get counceling.
This. Showing anger/getting mad could push her over the edge...this is the time for sympathy/empathy.
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