You are liable to get yourself into more trouble by acting foolishly. As you noted, you should not be making the kind of admissions you are making here in public. You should discuss the facts of your situation only with your attorney, should you be charged with a crime. An ordinary citizen has no ability to file a criminal complaint against anyone. The best you can do is report her actions to the police and, if they have a tape that she gave them, then they already know she recorded you. You going to the police or making any statements to the police whatsoever would be doing yourself a terrible disservice. If you are contacted by her or the police, you should say absolutely nothing. It is common for the police to put someone up to making recorded pretext calls to a suspect. If there is a case against you, it will be your own statements that will be used as proof. So don't make any statements to anyone except your attorney, should you hire one. Good luck to you.
This is not a situation that you should be investigating on your own. Any statements that you make to law enforcement can and will be used against you. The only time that law enforcement is required to read you your Miranda rights is if you have been detained, so if you start talking to them about the situation they can use any and all statements. This is what attorneys are for, to be your spokesperson. Hire an attorney who can communicate with the police department to find out what is going on.
Only the government can file criminal charges. It sounds like you are in a situation that you should not be handling on your own. You should meet with an experienced attorney in your area where you can speak freely and get good legal advice.
SLG Criminal Law Group
515 South Flower Street
Los Angeles, CA 90071