just thought of something..
before carol admitted to killing the 2 sick people, i thought it might have even been the little girl. now im thinking it still might be, and carol took the blame for it. remember at the fence when carol handed the knife to the little girl? and carol isnt dumb, so the "faking" of the girl was probably set up by her, to send her in to kill the rest off..probably some weird bond with her, reminiscing abkut her daughter..but then again why would she expose her so close to the other sick people? so my theory is probably wrong...haha i dont know..at least time went by faster at work thinking about this shit lol...