1.) Kashika tells Naruto what Sasuke did.
2.) While Naruto is out on a mission to murder Sasuke, she finds out she is pregnant.
3.) Naruto completes the mission and returns to Konoha
4.) Naruto helps raise and support the child as he wants to help her as a single mother.
5.) Years later the child asks who her father was. Kashika denying and telling her its Naruto, but not biologically.
6.) Mayumi, the daughter of Kashika, becomes a shinobi stronger and emotionally different than her mother. She seeks to learn more about her life and who her biological father really was, Sasuke Uchiha. Then gather intel about his life before death and how he was murdered.
6.) She lives a happy life with her child and has a strong mother-daughter relationship with her.