Why is Marie Antoinette kind?

Indeed, in reality, Marie Antoinette was the queen and wife of Louis 16, and she was for the counter-revolution and against the revolution! Moreover, the people of France did not like her for the habits of the rich and influential, and at the end of the revolution she was hanged, and in the game she was for good and SHE sent her bot to kill HER husband !!!!. Why couldn't they make Maria the same antagonist as Louis and finally kill her!!!