The idea emphasized by the figurative language in paragraph 1 of chapter 2 is:
D. Kiera feels strong affection and love for her mother.
In that paragraph, Kiera describes her mother as a "lightning bug" that she sees too little of, which conveys a sense of warmth and affection despite the physical distance and emotional disconnect they are experiencing. Kiera's feelings of love and appreciation for her mother are highlighted, even as she struggles with her own challenges.