She's already signed on with BetClick. From PokerNews Nightly:
Isabelle Rebounds Quickly
Isabelle Mercier is no longer a PokerStars Team Pro. That news has been covered by all of our fine media friends. She has, however, found a new home with BetClick, which is most well-known for its sportsbook, but which is attempting to grow its poker market. It will be opening sites in Belgium, Hungary, Netherlands, Czech Republic and Romania and hopes Isabelle's assets (ahem) will be a driving force in attracting a new player base.
Mercier was a PokerStars Team Pro for five years. She made a name for herself in 2004 by winning the WPT Ladies Night II event and has continued to do well since, amassing about $1 million in tournament winnings.
It didn't take long for her to sign with BetClick. It was a turnaround of about 2 weeks I think. Although it was nice to see that it wasn't Pokerstars canning her but her leaving on her own. I think Stars kinda screwed her though on the one TV commercial where they don't even use her voice.