I think they sort of showed that she's dead, they just haven't come out and said it or said that she really is dead. They dug three graves. T-Dog, Lori, Carol? I don't know who the third would have been for other than Carol. Obviously Lori's grave is empty because she was being digested by a walker. Maybe it's that they just show what happened to her next week in a flashback, but it seems that they have her marked as dead.
Plus in Talking Dead last night, Greg Nicotero, either intentionally or unintentionally, let slip something about her being dead. So I think her coffin has been closed.
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