Girl blackmailing to transfer money or she will publish personal pics

I was contacted by a girl by E-mail we chatted. She then wanted me to set up a Skype account. I did we chatted more then she video called me she was naked and asked to see my body. Stupid me I did she then hung up. She then contacted me said she made a copy of it and she is 17 and wants $1000 or she was going to send it to the DOJ. What can I do I didn't send the money -