A special ______ .

Habiba keeps a record of new words and expressions in English. He usually writes them in a notebook. Then, later in the day, she asks, bet teacher about them. "Mrs. Thomas, these expressions are new to me. She’s blue today. What’s the matter? You’re yellow? A little white lie. She has a green thumb. Blue and yellow people with green thumbs? White lie?" After looking at the notebook, Mrs. Thomas says, "In everyday English, Habiba, blue sometimes means sad. Yellow means afraid. A person with a green thumb grows plants successfully. And a white lie is not a bad lie." "I don’t understand. Please give me an example." "For example, I offer you some cake. The truth is, you don’t like my cake. You don’t say that. Instead, you say, No, thanks. I’m not hungry. That’s a white lie." "I see. Thanks for the explanation."
8. According to the article, "She’s blue today" probably means ______ .