I don't know what to do?

So I have this crazy niece and she posts about me nonstop, makes fake accounts and messages me and harasses me she has even sent me death threats before. She has brought me to court over lies and even made horrible lies about me like saying I abused her kids and everything. The police and courts say they can’t do anything about it. They say it’s just childish social media drama and the death threats would have to be said in person for them to be able to do anything. What would you do? I have blocked over 40 accounts of her harassing me. The legal system is a fucking joke.
I don't know what to do?
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