Did she turn heel suddenly, or where there hints/signs of this during the relationship?*
As a Black man living in this country, I'd look into getting ahead of this and trying to safeguard against your freedom. If she's talking crazy like this, can't rule out what she could say, do, or falsely accuse you of.
Shaking her isn't the issue, getting entangled by the legal system or possibly being harmed by her is the issue.
*Looking back, if she showed any signs that she was capable of this while you were together, lesson learned and choose better next time.