When the Uchiha Massacre happened Amber hid herself in her attic. While she had made a blood clone that Itachi kills. She was a Uchiha orphan. She was a prodigy and could learn any kind of jutsus after seeing it being used once. She was also the older sister of (by adoption) Naruto. She had the other half of the Kyubi's chakra.
After feeling Itachi chakra signature disappeared. She continued to stay hidden until morning. She then looked for other survivors and found a unconscious Sasuke. She took him to her house and took care of him. She was also very good in medical Ninjutsu, Taijutsu, Ninjutsu, Genjetsu, Kenjutsu, and Fuinjutsu. She then went to the Uchiha library and learned every jutsus there.
When Sasuke woke up he saw Amber he was shocked to see that he wasn't the last Uchiha. He asked how she avoided being killed by Itachi. She told him that she learned a forbidden jutsus known as Blood Kage no jutsu or Blood Clone. After seeing it being used once by Shisui Uchiha. Amber asked Sasuke why he was left alive. After he explained. Amber was shocked but she felt her clone's memories come to her.
She had made Shadow Clones to follow Itachi after he started to act weird for a week and her clones would disperse when they received important information and it just so happened that it found out Itachi's true reason for killing his entire clan except for Sasuke. She decided to explained this to Sasuke including all the information that her clone's had found out throughout the week. Sasuke was shocked and became extremely angry with the man behind his brother's actions.
Donza Shimura