Who The Hell Is She?

Things go differently, causing the King of Hell to gain a daughter who helps out a bit, causing our ever lovable heroes, the Winchesters to get a visit from a mystery woman. Set after Deathly Hallows, will most likely contain spoilers (if you haven't read, shame on you), set in Season 9ish of Supernatural. T for any language that may be used. I'm really bad at summaries, sorry.