Girl is blackmailing

Hello sir, Ill just come direct to the point. I need advice on how to handle this girl. She was texting me through Facebook from a long back and she was the one who sent all dirty pictures and tried to talk dirty to me being a guy I did not go to her. She took screenshot saying that I did all those things and shared it to my wife and my wife believed it and we fought. This had happened 2 years before. Now I got moved to someother country and she saw the opportunity and started texting me from a different account. Then I got to know it was her. So I said let's stop talking and I uninstalled everything. I had no link to her. Later I get a mail saying that I know your brother and sister see what ill do to them. And now she is blackmailing though I have not done anything. She was the one who came and spoke dirty. I just said if you want to be a good friend talk to me. I believed that she had changed but she again did the same and is asking for money the second time. What can I do sir plz advice