are you sure?

I have a guess or maybe theory on why she is so concerned about that music box.

hmmm, i think she might have association with the song

My guess was that since she was very little when she died, and sometimes little children have music boxes to help them sleep, maybe it reminded her of her life.

maybe it could be from fredbear. like freddy's jingle

Maybe.

Aww that’s so sad, I love it