Did killing accelerate the transformation process?
I apologise if this has been brought up before here, but I always wondered if this was true. There was a marked change in her appearance after killing Mr. Wayne for example, and especially after killing the janitor.
Or was it just with time, the transformation sped up? Before that, it seems as though throughout most of the month of October, her transformation was more gradual. During that time she wasn't killing people, only (as far as we know) two dogs, Norman and Morley (the latter referenced in the bathroom scene which I only really discovered after reading this board!). Then again I guess it could be argued that she had killed other people, although unlikely because it seemed to be a progression, i.e. dogs to people.
Was it once again supposed to be a metaphor of sorts that the physical change was a reflection of her altered mental state, i.e. becoming devoid of emotion, which was a result of her killing people?