The Lost Secret of Fairies: The Crystal Keeper Chronicles Book 1

Wanda had always read about adventure. Now she was in the middle of one. The World of Fairies is real, and she is their new Crystal Keeper, human caretaker to the World of Fairies. But the Fairy World is in trouble. The fairies are falling ill from the pollution that ravages the world above. Wanda has to find the key to their cure, before it's too late.