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Why did Empress Elizabeth of Russia oppose Frederick II of Prussia?

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Seven Years' War: Battle of Zorndorf — Seven Years’ War Frederick II leading his Prussian troops against Russians at the Battle of Zorndorf during the Seven Years' War, August 25, 1758.

Empress Elizabeth of Russia’s opposition to Frederick II of Prussia during the Seven Years’ War was driven by a combination of strategic foreign policy and personal indignation.

Under the guidance of her chief adviser, Aleksey Bestuzhev-Ryumin, Russia maintained a firm pro-Austrian and anti-Prussian foreign policy. This stance was solidified by the "diplomatic revolution" of the mid-1750s. When Great Britain—previously a potential ally—signed the Convention of Westminster with Frederick II in 1756, Elizabeth was deeply offended. She viewed the agreement as a betrayal, as she had intended for any Anglo-Russian arrangement to be directed against Prussia.12

Following this diplomatic shift, Elizabeth moved to align Russia with Austria and France to counter Prussian influence. Her indignation at Frederick’s actions accelerated a rapprochement with France, leading Russia to pledge 80,000 troops to support Austria in its efforts to reclaim Silesia from Prussian control.1342