You was just a girl (15y.o.) when you were sent to Azkaban fot 10 years for something you didn't do. Slytherins boys tried to explain that you didn't done it but no one believes them. You was cheerfull, calm, kind, always positive and smiling and sweet. But Azkaban changed you. Maybe more then anyone counted with. Now, you're coming back after 10 years of beigh locked in dark cell with not so friendly withes and wizzards.