So, you have a character who was sexually abused by her father, her mother never did anything to stop it, so one day when she was a teen, she made a deal with a Demon to kill her parents to save herself. And because of all this, she doesn't trust anyone, she's built walls around herself, and is a little bit of a bitch as a way of self preservation. She had stolen from Sam and Dean, granted, on seperate occasions to protect herself from something far more dangerous than them. And when she finally realizes that she's screwed with no way out and begs Dean, crying to him on the phone, for his help, he's like "oh, well, too bad, sucks to be you". She gets ripped apart by Hellhounds not even a few minutes later. Neither brother ever showed up at her Motel room or even gave her a second thought since. I, honestly, don't know how they can live with themselves.