Selina wasn't sure what there was to say. It would most likely start with her asking if he really was alright. She didn't believe him when he said he was, because he was like her. There was always something in the back of their minds that was keeping them from being alright. Yet he insisted so she wasn't going to ask for now.
Instead she just scooted over next to him and put her head on his arm. Not enough to hinder him from driving, but just enough to let him know she was there.