SimplyAwesome

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After intense training, abusing Multi-Shadow Clones and Sharingan, Kei Uchiha made a name for herself during the Third Ninja War, becoming a Kage level ninja. But, Onoki arrived, and turned her arm and legs to dust.

Akame Uchiha, the daughter of Izuna and niece of Madara Uchiha, became a student of Tobirama and her mother, who was a reincarnator, trained her as well. When Tobirama and his students were ambushed by Kinkaku and Ginkaku force during the peace talks with Kumo after the end of First Ninja War, Akame volunteered to be the bait, and Tobirama, with a proud smile, made her the Third Hokage.

*NOTE* Adoption of Exapro's "Naruto: Reincarnated as Sakura". I have the author's permission to do changes to the story as I like