She's the child of Sasuke ... of Eternal Mangekyo Sharingan without even gaining this eye. This would be made possible by her awakening the Bykaugou, just like Sakura, and forcing her body to ...

Itachi told Sasuke that he did it to test his strength because he wanted Sasuke to come after him and end his life, granting Sasuke the Eternal Mangekyo ... his body, he gave his Sharingan ...