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In page Yekaterina Vorontsova-Dashkova:

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The couple was close friends with Grand Duchess Ekaterina Alexeyevna and disliked the Grand Duke Peter, fearing for the future of Russia under the rule of the pro-Prussia future tsar. In December 1761, Empress Elizabeth became severely ill and died January 5, 1762. Her nephew ascended the throne, began undoing her policies and kept a submissive position towards his idol and Russia's enemy, Frederick the Great, much to the displeasure of his court and military. Yekaterina, along with several nobleman and members of the Imperial Guards, led a coup d'état against him on June 28, 1762, that put his wife on the throne.[citation needed]