Just thought you might need to know this

Bella is Deans twin sister.

So she and Dean both went to Hell.

When they went to Hell, they both finally gave in after three of our months, thirty years in Hell. They learned to torture, but only tortured the worst of the worst, people who actually deserved it.

Bella specialised with vampires, and consequently learned how to control Hells fire.

They were thrown out of Hell, because they revolted.

They tag teamed the Demons, and tortured then killed them, for what they had been doing since the beginning of everything to the human race. But at least the demons died, the people the demons torture, are never so lucky.

We may or may not know Sam is Lucifer's party suit, Dean is Michael's, so you may want to know that Bella is Gods party dress, just cause I felt like it.

The three of them stopped the Apocalypse, but Lucifer decided he didn't want Bella and Dean back again, and wasn't going to take any chances with Sam.

So now they are thrown out of Hell, since Heaven doesn't want them, starting again at 17 each time. Its still 2009, they've only just stopped the Apocalypse.

All of the Hunters know about their slight problem with dieing, and Charlie, a retired Hunter, agreed to 'take care' of Bella until she is legally allowed to actually do the things that she used to do.

John Drian and Susan Drian are also retired Hunters, are 'adopting' the boys, while Bella plays the long lost daughter of Chief of Police Charlie Swan.

That's all I can think of for now, if something weird happens, just go with the flow of my story.