Misunderstanding of cyber crime please advise

Hi.. I had met a girl on fb. Suddenly the conversion went wrong. We were talking about something . I told her that I'll tell her father that she had sex with someone in a funny way.but she took it seriously. Suddenly she said that I do wanna kill her and her father . My net was slow . My message reached her after she sent me that message . I wrote in the message that "do as I tell you to do" . She thought that I'm threatening her . It was completely misunderstanding. I was joking. Now she is telling that she will tell the cops. I'm really afraid. And we are not from same country .Please help me. Is it punishable? I would be glad if you can give me your email. By this way I can discuss everything in details.