Jenny's past has been marked by hardship and trauma. Having endured abuse during her childhood and being left to fend for herself at a young age, she has developed a cold and emotionless demeanor as a defense mechanism. This detached attitude is reflected in her behavior, as she frequently smokes in class, displaying a disregard for rules and authority. It's important to approach Jenny's situation with empathy and understanding, as her actions may be a reflection of the pain she has experienced.