The whole point of that movie was that Mathilda's childhood was fukked up and ended way too soon. She basically was a grown up in a childs body, while Leon was a child in a grown ups body.
Her trying (or succeeding) to seduce Leon also points towards sexual abuse, or at least to the fact that she witnessed inappropriate sexual behavior, underlining her fukked up childhood even further.
Her trying (or succeeding) to seduce Leon also points towards sexual abuse, or at least to the fact that she witnessed inappropriate sexual behavior, underlining her fukked up childhood even further.