Ã lisabeth Charlotte d'Orl Ã ans ( 13 September 1676 â `` 23 December 1744 ) was a niece of Louis XIV and wife of Leopold , Duke of Lorraine . She was later regent of Lorraine . Ã lisabeth Charlotte d'Orl Ã ans ( 13 September 1676 â `` 23 December 1744 ) was a French petite-fille de France and by marriage to Leopold , Duke of Lorraine , duchess and later regent of Lorraine , Bar and Teschen .