Life Simulation: The Empress Defies the Ages for Me!

(Gender-bending + System + life simulation + empress + high martial arts + supernatural abilities) [In your first life simulation, you are unfortunate enough not to transmigrate to a gathering place of immortals.] [You live among mortals for ten years. In a ruined temple, you find an abandoned baby and become her older sister.] [Ten years later, you take her with you to the Feathered Transformation Sect.] [Unfortunately, your little sister has no talent for cultivation.] [In your first life simulation, you have no experience and don't understand the value of keeping a low profile.] [An old monster in the sect sets his sights on your Supreme Bone.] [You have no way to fight back, but you split your Supreme Bone in two and leave one half to your little sister.] [You die.] [To find you, your little sister traverses the river of time.] [In your second simulation, you transmigrate to a world of swords and magic.] [You become a demon, summoned into this world by a knight whose family has been destroyed.] [By the time you arrive, the knight's entire family has been slaughtered, leaving only a silver-haired girl.] [The girl's talent for swordsmanship is monstrous, and you teach her how to wield a sword.] [Demons can't remain in the human world for long. The world's corruption is affecting you, and you don't want to become a truly bloodthirsty demon, so you want to end the simulation early.] Heaven is impartial and treats all things like straw dogs. The System malfunctions and turns Gu Nian into a girl. Still, being able to simulate life is some consolation. Without hesitation, Gu Nian starts her first life simulation.