Why did Nancy fetch Oliver Twist from fagin's hideout?

Nancy fetched Oliver Twist from Fagin's hideout out of a sense of compassion and moral obligation. She was deeply troubled by Oliver's innocent plight and wanted to protect him from the corrupt influences of Fagin and the criminal world. Additionally, Nancy had developed a bond with Oliver and felt that he deserved a chance at a better life, free from the dangers of his current surroundings. Her actions ultimately reflect her internal struggle between loyalty to her criminal associates and her desire to do what is right.