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I am sorry to hear this.
It may be time to retain a lawyer to send this woman a letter. The letter would demand that these defamatory statements and the harassment cease and desist and would threaten a lawsuit for damages.
And it would be prudent to put in another report to the police. If she continues in this way the police may consider speaking to her or eventually charge her with harassment.
As well, if the letter doesn't work you may be able to obtain a restraining order if you can show this harassment is persistent so keep a log of all that she says and does.