Athena saw how Dean was thinking about something and he didn't even realise that she is here... She so wanted to read his mind but she doesn't want to at the same time... And keep the provacy between them...
But seieng him didn't even sense her made her suspecious about him that what had he been thinking about that is making him go crazier with his thoughts.
She took a deep breath as she walked towards him and kept his hand on his shoulder. She is trying to figure out what is wrong with him with his words and talking but she failed miserably. And the way he lokked at her made her know that he is really tired. And she knows that he had been taking care of Rachel since the morning because of her fever and she really appreciate his help. And so, she didn't try to mind anything and believed that he had been tired and so, he didn't sense her.
And saw him walked towards his room and so, she smiled and walked towards Rachel's room.