Is this harassment? Or something else serious?

So I sent nude pics to my ex (do not lecture me on what's right and wrong. Trust me, I know I made a mistake and never will again.) but my ex friend knows abt it and she is tryin to use it against me. She has said things to me like "u Better call me back. We have some serious talking to do. If you don't I'll call the cops n tell them abt the pics" so I give in and now she is vein rude to my mother saying she has a court date when she obviously does not. Overheard her mom on the phone saying they r not. Gonna call the cops. The fact that I sent pics has nothing to do with her except for the fact that her Bf is best friends with the guy I sent them to. This has been going on for about a week now. So is this considered harassment? If not what does she have to do to make it considered harassment? Also she calls me a whore slut dumb ***** and tells me to go to hell. And says rude things to my mom. Thanks! God bless you all. <3