Hazlehurst said she had received a lot of information "most of which is hearsay".
She confirmed she did not know where the leaked information came from and had not accused Harvey of being the source.
At an extraordinary meeting due to be held on Friday, a decision will be made on whether to ask the chief executive to carry out an independent investigation into how the Public Excluded Agenda got into the public domain.
"If the investigation goes ahead all information will be provided to the investigator," Hazlehurst said.
At an emergency meeting called last Friday evening, councillors in attendance were unanimous in their decision to request the chief executive to prepare a declaration that they may sign to state they have no involvement with the unauthorised disclosure of confidential information.
However, signing of the declaration is on a voluntary basis.