Here is her terse Wikipedia article, "Archduchess Maria Immakulata of Austria (German: Maria Immakulata Rainera Josepha Ferdinande Theresia Leopoldine Antoinette Henriette Franziska Karoline Aloysia Januaria Christine Philomena Rosalia, Erzherzogin von Österreich, Prinzessin von Toskana) (3 September 1878, Baden bei Wien, Lower Austria, Austria–Hungary – 25 November 1968, Schloss Altshausen, Altshausen, Baden-Württemberg, Germany) was a member of the House of Habsburg-Lorraine and Archduchess and Princess of Austria, Princess of Hungary, Bohemia, and Tuscany by birth. Through her marriage to Duke Robert of Württemberg, Maria Immakulata was also a member of the House of Württemberg. Maria Immakulata was the seventh child and fifth eldest daughter of Archduke Karl Salvator of Austria and his wife Princess Maria Immaculata of Bourbon-Two Sicilies.
Maria Immakulata married Duke Robert of Württemberg, fourth child and second eldest son of Duke Philipp of Württemberg and his wife Archduchess Maria Theresa of Austria, on 29 October 1900 in Vienna. Maria Immakulata and Robert did not have children.”
She could be confused with this Princess Maria Immaculata.