Leaving the one's you love most behind

What if Minato was saved none other than his little sister Allison Namikaze who he raised from being a baby after their parents decided they did not want her and planned to throw her away like trash. What if instead of Minato dying it was just Kushina and his sister who he loved like a daughter, faked her death after performing a Seal which should have killed her and she fled knowing it was the safest thing for the village, Minato, Kakashi the person she loves and Naruto because people would come after two nine tailed host so she became a spy for the village only listening and meeting up with the former 3rd Hokage because she did not want to hurt Kakashi or her brother even more than she had to.