 Isabelle and her sisters made dynastic marriages.Her sister Princess Katharina married Archduke Martin of Austria, the youngest son of Robert, Archduke of Austria-Este and Princess Sophie married Georg Friedrich, Prince of Prussia, Head of the House of Hohenzollern.Isabelle was married to Prince Carl of Wied on 26 April 1998 in Birstein who in 2000 would become The Prince of Wied after succeeding his father.