King Gustav eventually gave Margaret political assignments and responsibilities. He gave her tasks such as supervising the governors of royal estates and power holders such as bailiffs or landholders, in order to prevent power abuse that could otherwise breed political unrest and rebellions. In 1543, he asked her to send spies to Södermanland to investigate whether there was any truth in rumored plans for rebellion there and if so, why the peasantry was discontent. She was entrusted tasks within foreign policy: when her brother Sten was sent as ambassador to the French royal court in 1542 in order to negotiate a Swedish-French alliance, Margaret was tasked to perform a diplomatic correspondence with the French king's influential sister Marguerite de Navarre in Latin, and she also attended the First Treaty of Brömsebro (1541).