Played through season one a few times and the start always seemed to bother me. The walkerfied babysitter gets the jump on Lee, but how did she die?
The following is an over thinking of an inconsequential situation, wall of text incoming.
When Lee gets to Clem's house all the doors and windows are closed and the backyard is secure and clear of walkers (Doesn't mean much in itself as Clem could have influenced this state). Therefore if the babysitter was killed by a walker it should still be around or the babysitter could have followed the group mentality and left with other walkers.
It's possible she was killed and took some time to turn after the walker had left, becoming a lurker just waiting for a living creature. But the pool of blood in the kitchen is still fresh, which suggests she wasn't killed too long ago. And the child sized footprints to the drawer with the walkie-talkie (How many of these things does Clem have...) implicate Clem as being there after the pool was formed.
Now we don't know anything about upstairs as the bookcase blocks access. It is possible that the babysitter was attacked upstairs and has barricaded the walker up there.
The answering machine hasn't been accessed in a few days which would indicate that Clem has at least been living in her tree house for that long. The messages highlight the start of the outbreak in Savannah. Not knowing where the outbreak started and which direction it spread, assumption here is that it hit Savannah before Atlanta, it all means that the babysitter was dead before the outbreak got to Atlanta. This contradicts the fresh blood however (do walkers bleed red blood?).
When Lee is finally attacked Clem offers the hammer and is not even moved by her babysitter receiving sever cranial trauma, Clem clearly has no relationship with her sitter and is not concerned by a stranger being in her house that she earlier saw shoot a police officer in the head.
So my theory is that Clem isn't such an innocent child. Her parents left her at home with a sitter to take a holiday, was she grounded and not going a punishment or was it their anniversary and they wanted time away alone? We latter learn her parents often go to Savannah and stay at the same place which indicates a pattern of them leaving Clem with a sitter.
This could lead Clem to resent her sitter, maybe she took her walkie-talkie away which caused Clem to snap. And her parents never instilled a sense of 'stranger danger' to her as she is all too willing to leave her house and go with Lee, someone who she would have seen in handcuffs and killed a walkerfied police officer. Spolier She also goes with the stranger so readily to find her parents.
I feel that Clem isn't such an innocent and naive child and was responsible for her sitters death. This could also be why she accepts Lee so easily as they both share the same secret of murder. Therefore she sees Lee as someone she can become and that murder doesn't mean you are necessarily a bad person in all situations.
So what do people think, did Clem kill her babysitter?