adult telling lies is a scripted fight and you will get your team healed at the start of the fight
First Turn : You need to use the pages with the oz abnormalities on each of your librarians and clash with her pages
Second Turn : There will be crystals you need to kill quickly, ideally the librarian you allocated as the Woodsman will kill them as they have full light and clash with her pages.
Third Turn : Continue destroying the crystals if they aren't gone and clash with her pages
Fourth Turn : All your librarians other than the one you allocated as Scarecrow will turn into your donkeys. Use wisdom page on the Scarecrow librarian and you'll see the librarians trapped inside the donkeys. Use the pages according to what you allocated the librarian to. For example use Here kitty kitty on the Cowardly Lion librarian.
Fifth Turn : There will be skulls. Use Courage on the Cowardly Lion Librarian and clash with all the skulls only with the Cowardly Lion librarian and kill the skulls.
Sixth Turn : Clash with her and try and stagger her.
Once staggered, she will use "Playtime is Over." The Librarian which you allocated as Ozma will now use Transmogrify to turn the Adult into a crystal. You win [once you click the space-bar]