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If I were you I would just report everything to the police if you've already made a police report.  I wouldn't respond to her emails or her postings about you.  That only fuels the crazy.  If she's threatening you then you need to tell the police and if she's slandering you then you need to tell a lawyer.  Have the lawyer respond to her emails and posts.  Remove yourself as much as possible from the crazy and continue on with your life.