WHO IS RIVER SONG? I want to know NOW?

I just want to know your theories because mine is this tell me what you think I reckon what happened is rive is the girl in the astronaut suit in season 6 ep 1+2 which is the daughter of Rory and Amy but because the unborn child has been going around in the trades it's actually became a time lord so Amy gave birth and realised it was timey wimey so she left it on the street and thays why at the end of season 6 ep 2 the little girl regenerated probably into an adult river also why at the beginning of s6 e1 it looked like the doctor was greeting the astronaut because it's river also she's locked up in prison because she '' killed the best man she ever knew'' probably Rory her half daddy