The Mennyms books by Sylvia Waugh are wonderful - it always makes me sad that hardly anyone has heard of them! They came out in the 90s and were my favourites as a child. They're about a family of rag dolls (human-sized) who have to live hidden away from the world - they explore what it is to be different, to be isolated, etc., but there's also much joy and beauty in them. One of the most poignant threads in the books is the story of the teenage daughter, who knows she can never grow up - there's so much to enjoy and I can't recommend them highly enough. Lovely writing and sophisticated storytelling but nothing inappropriate for a 9/10 year old.
Lots of people have mentioned Elizabeth Goudge - another writer who's not read much now, but The Little White Horse is wonderful for your dd's age group.
Noel Streatfeild's books are wonderful - away from the Shoes series, I really love The Painted Garden.
E Nesbit wrote much more than Five Children and It and The Railway Children - there's some great books in her back catalogue such as the Treasure Seekers stories and The Enchanted Castle.
Others from my own childhood I can think of are Moondial by Helen Cresswell, Tom's Midnight Garden by Philippa Pearce, The Ghost of Thomas Kempe by Penelope Lively, The Summer of Lily and Esme by John Quinn, A Wrinkle in Time series by Madeleine L'Engle...
More modern books to try are Peter Bunzl's steampunk Cogheart series and anything by Lauren Wolk, whose books are so well written. Emma Carroll's historical fiction is also fantastic - Letters to the Lighthouse, Strange Star, etc. Geraldine McCaughrean is wonderful, too - Where the World Ends and The Middle of Nowhere are her most recent novels, and they're brilliant. Anthea Simmons' Lightning Mary, about Mary Anning, is also very good.
I'm a secondary school English teacher, so I'm giving you recommendations around the level of a Year 7 aged reader - it sounds like your dd is quite advanced, so all of these should be fine.
Hope some of those appeal!