Yes, Miller is in jail for contempt of court. Why is she in contempt? Because she refuses to testify.
Is leaking classified information still a crime? If so, was she a witness to that crime being committed?
You have to testify about a crime if you are a material witness; it is not optional...not for *any* crime.
Right but she would still be in jail for not obeying the court whether or not there was a crime. Merely impeding the investigation of a possible crime would do it. I do not believe there was a crime here certainly not involving Rove.