My ex friend is going round spreading secrets I told her during the friendship, and spreading rumours about me. What to do?

I dumped this friend because she was incredibly toxic. She was not very nice at all. Now because the friendship is over, I've heard she's gone around telling EVERYONE my secrets I told her about my childhood abuse, embarrassing things about me and everything else I told her during the friendship in confidence. She has also been making up lies about me and spreading rumours that simply aren't true.

What should I do to stop this? Or should I even attempt to stop this?

My ex friend is going round spreading secrets I told her during the friendship, and spreading rumours about me. What to do?
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