"Oh I am not your mother, Ronald," Hermione exclaimed, as exasperated as he seemed to be and entirely missing the irony of using his full name just as Molly Weasley did. "I suppose the idea of maybe buying some fruit entirely passed you by?"
She wasn't being sarcastic...alright, she was being somewhat sarcastic, but it was overlaying no small amount of concern. What would Ron have done if she hadn't been brought here too? The idea that he couldn't look after himself worried her. More than she cared to admit.