Polignac is the name of her grandfather. And AFAIK just the children of the current reigning Prince of Monaco (or reigning Princess of Monaco) have the title. So Louis, Camille or Pauline won´t inherit the title. Caroline is currently Caroline, Princess of Hanover, Hereditary Princess of Monaco, Countess of Polignac
back at you
But the current reigning Prince is Albert, and Caroline and Stéphanie aren't his children (mind, his two children don't carry the title either
). So were they allowed to keep the title after Rainier died? Will they have to give them up when Charlene pops out the heir and the spare?