Sympathy for the Devil

Ness Singer is being just as there for the Winchesters and her father as before, maybe even a little bit more.
Because now that the angels and the demons have started the Apocalypse with the help of Dean and Sam of breaking the first and last seals. And they are the only ones that can stop the Apocalypse, and possibly the only ones with enough power that want to.
So, now, it's just up to Sam, Dean, Ness, Castiel and Bobby to set things right and save everyone, but does that mean everyone will make it out alive?