Should I forgive her or not?

Earlier today, my sister got mad at me because she's mad at her boyfriend (i know very sad) but sadly; it's true. anyway, i told my daughter not to go towards her. Next thing i know, she jumps up and started calling my daughter names saying she hope she dies in her sleep. I'm so sick of this woman talking crazy towards my daughter and me. Should i stay away from her or give her another chance?
Should I forgive her or not?
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