I know of nothing that would release her from the provisions of a contract she willingly entered into just because she received a subpoena. Generally the terms of such a non-disclosure agreement provide that she is liable for any compensation she received under the agreement if she breaches the non-disclosure provisions and perhaps other stipulated penalties in the agreement. At a minimum she, or Conyers, could ask for a protective order prohibiting the disclosure of the information sought by the subpoena or placing such information under seal and prohibiting its disclosure to anyone but the court.