She is already a WPP non-executive director on its board.
Analysts assessed whether further downgrades will be a broader industry issue.
Winners announced on final night at Palais.
Five of Campaign's global editors spoke on a panel at Campaign House in Cannes.
Board begins formal search for new CEO.
The visceral response to the latest restructuring has been a lament for the way the holding company has moved too slowly and downgraded its agency brands over many years.
Top news, insights and analysis every weekday
Sign up for Campaign Bulletins