Was a reason ever given as to how she lost the hair? I know she had trichotillomania hence the patchy brows but did she pull out the hair on hear head too or has some ailment caused it to fall?
Likewise with the teeth. I know some were suspecting she pulled them out, but this isn't an easy thing to do unless they are already rather loose (which may be the case considering she's mostly bed bound and I doubt she's bothering to keep them clean).
Kelly's a strange case in many senses, she doesn't suffer from the "princess waif" syndrome, as I'd call it, that other borderline munchie women do, in that she has no problem making herself as ghoulishly repulsive in appearance. She doesn't try to keep herself looking attractive or beautiful despite her self-inflicted illnesses, only opting for 'aesthetic' choices like self harm scars , but instead actively tries to exaggerate what makes her physically hideous.