"The Cat Who Came in from the Cold" by Jeffrey Moussaieff Masson. A story about a wild cat who contemplates if he wants to live closer to humans. He takes a year and travels about interviewing other animals he sees interacting with humans and asks about their experience. Part way through the book I thought, "This author's name is familiar." Turns out I've read two of his books on the emotional lives of animals. It's been awhile, though.
I also read "The Girl Who Reads on the Métro" by Christine Féret-Fleury, a quirky little story about a young woman and how books changed her life. Translated from French.
I dislike this trend of titling books"The Girl Who..." when the main character is actually a woman, which is the case, most of the time. I think "The Girl with the Dragon Tattoo" started it and it was appropriate, since Lisbeth was a girl during that story. She was 17, IIRC. They would never title a book "The Boy Who..." when the main character was a 20 year old man.
I gave up on "Gwendy's Magic Feather." I thought it was boring. There was too much detail about her daily life and one-time characters, and not enough action with the mysterious box.