If you are looking for a gift for a book lover who already has every book she could ever want, you could always consider going an alternative route. Literature Jewelry! Apparently these books are actually usable and wearable!
Here is the description from the creator's Etsy shop:
My books are made using archival insides and antique outsides. Inside you'll find lineless strathmore drawing paper - thick, hand-torn, acid-free pages that work perfectly with ink, pens both thick and superfine, pencil, charcoal, and myriad other mediums. the pages are each hand sewn with archival linen binder's thread. The books' covers are made using hand-picked scraps and worn leather from wherever I can find them, cut to fit the appropriate size. The books can be carried daily and beat up. They are quite strong creatures.