The Public Accounts Committee has told Angela Kerins she can't have any say in the moves to force her to appear.
Solicitors for the former Rehab C-E-O have written to the committee, asking if she can have any input in the plans to seek compellibility.
But she's been told that the legal process involves TDs only - and that she cannot have a say.
Chairman John McGuinness says the committee might have to wait until the summer recess before a decision on whether it can go ahead with plans to force Ms Kerins and her predecessor, Frank Flannery, to appear.
He says the official application to force Ms Kerins to appear has already been lodged:
