Annette Curtis Klause said this quote

Like Mom, Zoe thought–like Mom used to. And that’s where they differed, for Zoe wrote quiet poetry suffused with twilight and questions. It’s not even good poetry, she thought. I don’t have talent, it’s her. I should be the one ill; she has so much to offer, so much life. “You’re a dark one,” her mother said sometimes with amused wonder. “You’re a mystery.