Exactly, she said she'd met him as a young girl and he knew all about her, I don't think she's referring to the events of her life as we know them from LKH. I think she IS the one raised by Amy and Rory, which is why we've had all these unreal/rewritten hints of how superhuman and awesome and River-like both Amy and Rory have the potential to be, I think it's to set us up to believe that the River we know could totally be a product of their upbringing.