Ameko Kaeruda 
Dragon Daddy Diaries: A Girl Grows to Greatness (Manga) Volume 2 [EPUB ebook] 

The elder dragon and Olivia have settled comfortably into their new life together, along with the Dark Queen Maredia and her loyal retainer Clowria. Daily life is full of excitement and new discoveries for all four of them, but as the years pass, Olivia grows more and more conscious of her isolation from the rest of human society. The solution, proposed by Olivia herself, is easy enough—she wants to go to school! After some brief panic at the thought of Olivia leaving the castle, the dragon finds the perfect school for her. Sure, the entrance exam for nine-year-olds is so difficult that the thousand-year-old Dark Queen can’t manage the practice questions, but only the best will do for a girl as intelligent (and adorable) as Olivia!