Question: Which courtier did Empress Elisabeth of Austria suspect of being a spy, in part because she was a confident to the identical twin sister of Princess Maria Anna of Bavaria?

Context paragraphs:
Sophie Esterházy: Sophie Esterházy-Liechtenstein (1798-1869), was an Austrian courtier.  She served as Oberhofmeisterin (mistress of the Robes) to Empress Elisabeth of Austria in 1854-1862.  She was disliked by the Empress, as she was a confidante of the Empress' mother-in-law, Princess Sophie of Bavaria, and suspected to be her spy.  She was also described as very strict, and her attitude toward Elisabeth was compared to a governess.  She was replaced by Pauline von Königsegg.  She has been portrayed in numerous books about Elisabeth.

Duchess Maria Anna Josepha of Bavaria: Maria Anna Josepha of Bavaria ("Maria Anna Josepha Augusta"; 7 August 1734 – 7 May 1776) was a Duchess of Bavaria by birth and Margravine of Baden-Baden by marriage.  She was nicknamed the "savior of Bavaria".  She is also known as "Maria Josepha" and is sometimes styled as a "princess of Bavaria".

Archduchess Maria Anna of Austria (1882–1940): Archduchess "Maria Anna" Isabelle Epiphanie Eugenie Gabriele of Austria, full German name: "Maria Anna Isabelle Epiphanie Eugenie Gabriele, Erzherzogin von Österreich" (6 January 1882, Linz, Upper Austria, Austria–Hungary – 25 February 1940, Lausanne, Vaud, Switzerland) was a member of the Teschen branch of the House of Habsburg-Lorraine and an Archduchess of Austria and Princess of Bohemia, Hungary, and Tuscany by birth.  Through her marriage to Prince Elias of Bourbon-Parma (later Duke of Parma), Maria Anna was also a member of the House of Bourbon-Parma and a Princess of Bourbon-Parma.

Frederick Augustus II, Grand Duke of Oldenburg: Frederick Augustus II (16 November 1852 in Oldenburg – 24 February 1931 in Rastede) was the last ruling Grand Duke of Oldenburg.  He married Princess Elisabeth Anna of Prussia, daughter of Princess Maria Anna of Anhalt-Dessau and Prince Frederick Charles of Prussia.  After her death, he married Elisabeth Alexandrine of Mecklenburg-Schwerin.

Mary Drake: Mary Drake is a fictional character created by I. Marlene King and portrayed by Andrea Parker in the American television series "Pretty Little Liars".  "Pretty Little Liars" is a television adaptation of the novel series of the same name written by Sara Shepard, in which the antagonist Alison DiLaurentis has an identical twin sister, Courtney DiLaurentis.  It is believed that Mary is the on-screen counterpart of Courtney, though her recent characterization is more in line with Alison.  The character makes her first official introduction during the sixth-season finale "Hush, Hush, Sweet Liars".  The Liars discover that Mary is Jessica DiLaurentis' identical twin sister, a former patient at Radley Sanitarium who is Charlotte's biological mother.  In "The DArkest Knight", Drake is also revealed to be Spencer Hastings' biological mother.  During "Till Death Do Us Part", the elusive A.D. is revealed to be Alex Drake, Spencer's younger identical twin sister.  Alex believed the Liars knew who was accountable for Charlotte's murder and was also set on physically replacing Spencer due to being jealous of the life that she had.

Princess Maria Pia of Bourbon-Parma: Princess Maria Pia of Bourbon-Parma (née Princess Maria Pia of Savoy; born 24 September 1934) is the eldest daughter of Umberto II of Italy and Marie-José of Belgium.  She is the older sister of Princess Maria Gabriella of Savoy, Vittorio Emanuele, Prince of Naples, and Princess Maria Beatrice of Savoy.

Duke Pius August in Bavaria: Duke "Pius August" in Bavaria, full German name: "Pius August Herzog in Bayern" (born 1 August 1786 in Landshut, Electorate of Bavaria; died 3 August 1837 in Bayreuth, Kingdom of Bavaria) was a Duke in Bavaria as a member of the Palatine Birkenfeld-Gelnhausen line of the House of Wittelsbach.  Pius August was a grandfather of Empress Elisabeth of Austria through his son Duke Maximilian Joseph in Bavaria, as well as a great grandfather of Queen Elisabeth of the Belgians and an ancestor of the current generations of the Belgian and Italian Royal Families and the Grand Ducal Family of Luxembourg .

Princess Sophie of Bavaria: Princess Sophie of Bavaria (Sophie Friederike Dorothea Wilhelmine; 27 January 1805 – 28 May 1872) was born to King Maximilian I Joseph of Bavaria and his second wife Caroline of Baden.  She was the identical twin sister of Princess Maria Anna of Bavaria, Queen of Saxony as wife of Frederick Augustus II of Saxony.  Her eldest son Franz Joseph reigned as Emperor of Austria, and King of Hungary; her second son Maximilian reigned as Emperor of Mexico.

Archduchess Maria Anna of Austria (1610–1665): Archduchess Maria Anna of Austria (German: "Maria Anna von Habsburg, Erzherzogin von Österreich", also known as "Maria Anna von Bayern" or "Maria-Anna, Kurfürstin von Bayern"; 13 January 1610 – 25 September 1665), was by birth Archduchess of Austria and member of the House of Habsburg and by marriage Electress of Bavaria.

Maria Anna of Bavaria (1805–1877): Princess Maria Anna of Bavaria (German: "Maria Anna Leopoldine Elisabeth Wilhelmine von Bayern" ; 27 January 1805 – 13 September 1877) was Queen Consort of Saxony from 1836 to 1854.

Supporting paragraphs: Sophie Esterházy Princess Sophie of Bavaria
Answer: Sophie Esterházy-Liechtenstein