She heard the knock and then the sound of her name and it really didn't suprise her. She hadn't called after, she hadn't given any indication that she was just at her place and not simply vanished. Jo pressed her teeth into her bottom lip weighing the options. Sure she could just ignore it but it was Dean and she knew Dean wasn't above picking a lock or breaking down a door.
She got up and moved to the door to her room opening it to let him in with a small "hey". What she was even supposed to say she had no clue, how she was supposed to even begin to explain this was beyond her. So she just moved back towards her bed, sitting on the edge.