If the Orléanists had held the throne, she could have become Queen of France. Her Wikipedia article is here.

1837 Duchesse d'Orleans as a bride, nee Princess of Mecklenburg-Schwerin by ? (private collection) From Dr. Wolfgang Lorenz

Hélène de Mecklembourg-Schwerin, duchesse d'Orléans by François Meuret (Musée Condé - Chantilly, Picardie, France)
