The Cannon-Fodder Grand Princess Is Reborn and Rules the World

[Strong female-led wish fulfillment + reborn + female lead is completely unhinged and extreme + female lead stands alone with no male lead + political scheming]

In her previous life, the Ninth Princess devoted herself heart and soul to helping her elder brother ascend the throne. But the new Emperor was incompetent and foolish. Afraid the princess had won the people's favor, and spurred on by others, he grew jealous and cut off her supplies when she went to war. The Ninth Princess and tens of thousands of soldiers perished in the deserts of the north. Seeing her innocent soldiers die, the Ninth Princess fought to her death with hatred in her heart. Reborn, the princess is no longer constrained by the rules of propriety. If the princes are all so useless, what would be wrong with letting a princess like me rule this world...