[Batty]

Haha. Never thought about River being a Tardis, BUT, she had said she was taught to fly it, and you see the Doctor kind of go "Whaaa?". And then River, in all her fantastic glory, goes "SPOOILLERRSSSS!"

So I don't think so. I mean, even if she was... a human body wasn't really built to hold the soul of a Tardis. Thats why Idris burned out so quickly.