Question: What Russian female had siblings Alexander Vorontsov, Elizaveta Vorontsova, and Semyon Vorontsov?
Context: Vorontsov (Russian: Воронцов ), or Vorontsova (feminine; Воронцова), is a popular Russian surname which may refer to: Daikokuya Kōdayū (大黒屋 光太夫 ) (1751 - May 28, 1828) was a Japanese castaway who spent eleven years in Russia.  His ship landed at Amchitka, in the Aleutian Islands.  The crew managed to travel to the Russian mainland and Catherine the Great allowed them to go back to Japan.  This was made possible through the efforts of Kirill Laxman, Alexander Bezborodko, and Alexander Vorontsov.  Two of the crew made it back to Japan alive, though one died while they were detained in Yezo (Hokkaidō).  Of the original crew, two converted to Christianity and stayed in Irkutsk, and 11 others died. Countess Anna Karlovna Vorontsova, née Countess Skavronskaya (7 (18) December 1722 – December 31, 1775 (11 January 1776)), was a Russian lady in waiting, salonist and noble, cousin of the Empress Elizabeth of Russia.  She was married to Chancellor Count Mikhail Illarionovich Vorontsov. Countess Ekaterina Semyonovna Vorontsov (October 24, 1784 in Saint Petersburg – March 27, 1856 in London), sometimes spelled Woronzow, was the daughter of Semyon Vorontsov, the Russian ambassador in Britain from 1785, and the only sister of Prince Mikhail Vorontsov, Viceroy of New Russia and Caucasus (1782–1856).  She was also a niece of Princess Dashkova, a friend of Catherine the Great and a conspirator in the coup d'état that deposed Czar Peter III and put his wife on the throne. Princess Yekaterina Romanovna Vorontsova-Dashkova (Russian: Екатери́на Рома́новна Воронцо́ва-Да́шкова ; 28 March [17 March o.s.] 1743 – 15 January [4 January o.s.] 1810) was the closest female friend of Empress Catherine the Great and a major figure of the Russian Enlightenment.  Her name was often spelt in English as Princess Dashkov. Count Mikhail Illarionovich Vorontsov (Russian: Михаи́л Илларио́нович Воронцо́в ) (12 July 1714 – 15 February 1767) was a Russian statesman and diplomat, who laid foundations for the fortunes of the Vorontsov family. Alupka (Russian: Алýпка ; Ukrainian: Алýпка ; Crimean Tatar: Alupka ; ) is a resort city located in the Crimean peninsula, currently subject to a territorial dispute between the Russian Federation and Ukraine (see 2014 Crimean crisis).  It is located 17 km to the west of Yalta.  It is famous for the Vorontsov Palace, designed by English architect Edward Blore in an extravagant mixture of Scottish baronial and Neo-Moorish styles and built in 1828–1846 for prince Mikhail Semyonovich Vorontsov.  Population:  (2014 Census) The Vorontsov Palace (Ukrainian: Воронцовський палац ; Russian: Воронцо́вский дворе́ц ) or the Alupka Palace is an historic palace situated at the foot of the Crimean Mountains near the town of Alupka in Crimea.  The Vorontsov Palace is one of the oldest and largest palaces in Crimea, and is one of the most popular tourist attractions on Crimea's southern coast. Count Semyon Romanovich Vorontsov (Russian: Семён Романович Воронцо́в ; 26 June 1744 – 9 July 1832) was a Russian diplomat from the aristocratic Russian Vorontsov family, whose siblings included Alexander Vorontsov, Elizaveta Vorontsova and Yekaterina Vorontsova-Dashkova. Yuli Mikhailovich Vorontsov (also Yuliy Vorontsov; Russian: Ю́лий Миха́йлович Воронцо́в ) (October 7, 1929, Leningrad  – December 12, 2007, Moscow) was a Russian and Soviet diplomat, President of International Centre of the Roerichs (Moscow).  In the mid-1970s he was Chargé d'Affaires at the Soviet embassy in Washington under Ambassador Dobrynin.  He was then Ambassador to India (1978-1983) and France (1983-1986).  He returned to Moscow to be the first deputy foreign minister (1986-1990) and participated in arms reduction talks with the United States.  In 1988-1989, he was simultaneously the Ambassador to Afghanistan as Soviet troops withdrew from the country.  He then served as the last Soviet ambassador to United Nations between 1990 and 1991 and as the first Russian Permanent Representative to the UN from 1991 to 1994.  After this he served as the Russian ambassador to the United States from 1994 to 1998.  In 2000 Vorontsov was chosen as the high-level coordinator for issues related to a paragraph of United Nations Security Council Resolution 1284 which once again required Iraq to face "its obligations regarding the repatriation or return of all Kuwaiti and third country nationals or their remains, [and] the return of all Kuwaiti property [...] seized by Iraq" (during the invasion of Kuwait).
Answer: Yekaterina Vorontsova-Dashkova