Summery
When Shiemi (Fem-Sasuke) was born her father was disappointed in her because she was female.
He thinks she is a disgrace, and orders her older brother along with another Uchiha servant to take the baby into the woods far away and kill her.
Itachi and the servant obey and take her away from Konaha, but they are gracious enough not to kill her. They leave her at at families doorstep.
When she turns three her 'parents' are killed by bandits. She wanders off not knowing what to do.
Zabuza and a 5 year old Haku find her crying, what she didn't know was that her Sharingan was activated, so when she looked up at Zabuza they were revealed to him. He takes her in and raises her along with Haku.
When a man named Gato finds them and forces them to fight for him, she makes up her mind to do something about it.
When Kakashi is alone she takes her chance.
I don't own Naruto.