Why is Sachi in fatal bullet?

Why is Sachi in fatal bullet? Fatal BulletDue to a mysterious growing anomaly in her NPC coding, Sachi failed to recognize Kirito and gradually became unresponsive as a result of her Artificial Intelligence (AI) functionality apparently being consumed.

Fatal Bullet

Due to a mysterious growing anomaly in her NPC coding, Sachi failed to recognize Kirito and gradually became unresponsive as a result of her Artificial Intelligence (AI) functionality apparently being consumed.