Many years ago you were sealed because your power started to go beyond your control, you asked an elder to seal you because you were afraid that you could harm others..

(many years)

a little girl found you, printed you out and brought you to her home

Himawari Uzumaki: "Dad, can we keep this girl? She is very, very good! And she played with me and read me fairy tales!"

you were like a mother to him many years ago.. But he couldn't unseal you because it would have been dangerous

Naruto Uzumaki: Um.. Sorry, I'm working

Naruto's face changed when he saw that it was you standing in front of him... The same little girl