I want to mention the girl as I am thinking she might be Cal seeing as we havent actually heard her name yet. Also when she collapsed on the floor when the Doctor was sonicing the secuity camera thing the rug she was on had the same symbol on as the security camera and the computer terminals.
So the little girl could be the computer which is so complex that its created another world for her to live in to keep herself entertained mainly because there isnt anything really to be done in the library apart from watch over it (which shes does when she closes her eyes). Though I am probably wrong.
Oh also the idea of professor Riversong being Donna is as absurd as it being Jack or Jenny. She's just a new character *nods* well probably anyhow.
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