During her time in Sound Prison, Sakura may have changed in many ways. Physically, she might have become stronger from the manual labor or self - defense training she had to do. Emotionally, she could have become more closed - off at first as a self - protection mechanism. However, as time passed, she may have learned to open up selectively to those she could trust. Her skills, whether it was her combat skills or her ability to negotiate in a tough situation, would have been honed over the years, making her a more formidable character than when she first entered the prison.
Sakura could have become more self - reliant. In Sound Prison, she couldn't rely on others easily. So she had to learn to take care of herself. This might have also made her more street - smart, being able to quickly assess situations and people around her. She may have also developed a more cynical view of the world outside, having seen the darker side of society within the prison walls.