Feichai Gongzhu de Chongqi Rensheng

Her Highness the Princess inexplicably became Empress... Her Highness the Princess inexplicably met her end by the executioner's blade... Her Highness the Princess inexplicably reincarnated back to age six... Her Highness the Princess Lv999... This time, Her Highness the Princess will slaughter all in her path! Who says only heroes can restart their lives?!

(Source: Bilibili, translated)