The former CEO of the Rehab Group and Cashel native claimed its members acted beyond their powers during a hearing she attended in 2014.
Her legal action arose from a seven hour appearance she made before the Public Accounts Committee in February 2014.
By asking about her €240,000 salary and bonus payments, she claimed the members acted outside their powers in what she described as a “witch-hunt”.
The court heard previously that she was so overwhelmed by what happened that she later tried to take her own life.
In ruling against her, President of the High Court Mr. Justice Peter Kelly said today that the utterances complained of were clearly expressions of opinion devoid of any legal force.
He said she seeks to make the Oireachtas members amendable to the jurisdiction of the court – something that cannot be done.
To constrain members in the manner suggested would impair the effective functioning of parliament, he said, in a manner expressly forbidden by the Constitution.
