I have questioned it as well but there's still a difference. Diana loved, at best liked Kelly and was sad over what happened to her, Juliette orchestrated Kelly's demise. Diana doesn't know what really happened to Kelly, Juliette/Eve does. If Diana was wholly aware of what was happening to Kelly, perhaps she would have defended Kelly, the writing implies she didn't. Juliette deceived Kelly by setting a trap that left her outnumbered. She planned/had prior knowledge versus a child unaware that her guardian was facing pending doom.
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