The HP thread reminded me that DD somehow seems to know something is up with Professor Snape.

She has been practicing a rather emotionally intense piece and when I asked her if the piece reminded her of something or someone, she said Professor Snape. When I asked for an explanation, she said "it goes well with him because he is angry, sad, and has a lot of passion but mostly, he is very sad. There is a tragedy in him."

This was after watching the first two movies so she is probably reacting to how Alan Rickman portrayed the character.