She presided over the ministry during a difficult period, during which revenue declined a considerable amount due to a variety of factors.
She had previously served as director general of the Department of Finances, to which position she had been named in 2005.
Thevenoux remained in charge of the ministry until 2011, when she was replaced by Marco Piccinini; Marie-Pierre Gramaglia entered the cabinet at the same time, becoming the second woman in Monaco's history to be appointed to such a position.
In 2015 she was named Head of the Principality of Monaco's Mission to the European Union and the European Atomic Energy Community, presenting her credentials to Donald Tusk on May 7; at the same time she became Monaco's ambassador to Belgium, Luxembourg and the Netherlands, as well as Permanent Representative to the Organisation for the Prohibition of Chemical Weapons.
She previously served as Monaco's ambassador to France.