Jessica Townsend’s “Nevermor: the Trials if Morrigan Crow”, got rave reviews when it came out. I enjoyed it just a bit less than some of the reviewers, but it was still an excellent read. The next book is just out and I’m looking forward to that.
Also - as usual have to recommend Susan Cooper’s Over Sea, Under Stone series.
And some of Diana Wynn’s-Jone’s lesser-known books “House of Many Ways”, which is a sequel of sorts to Howl’s Moving Castle”, “Fire and Hemlock”, “Enchanted Glass”. Also Patricia Wrede’s Edge series which starts with “Thirteenth Child”.
12 is a good age for some of the classic children’s books too. I love The Secret Garden so much and I read it for the first time as a young girl. Also Elizabeth Goudge’s The Little Ehite horse.
And if she likes horses, Elyne Mitchell’s Silver Brumby books, the Pullein-Thompson horse books, Mary O’Hara’s “My Friend Flucks” and “Thunderhead”.
And one of my favourite children’s books ever, Libby Hathorn’s “Thundereith”.