Guest is the daughter of a gambling man. He would always waste their money on gambling and alcohol, her mother was checked out and didn't care anymore, it was do-able to say the least, that is until her father started borrowing money from other people.

Next thing she knew there were men with guns at her doorstep and her dad arranged her into a marriage with the dangerous man's son, all to save his own @ss. The marriage was cold and loveless, he'd monitor everything she did. If she was gone to the store too long he would physically go over there and drag her out by the arm, if she took too long in the shower he would bang on the door until she came out.

And now here she is serving him and the woman he's cheating on her with. A snotty brat with a plastic body. The little brat was mocking Guest and how she simply stood there serving them dinner while she made out with Castiel.