The Weirn books

"After her terrible adventures in the Silent Woods, Na'ya's world seems to have returned to normal...that is, except for the nightmares that keep haunting her. What she needs is the power to protect everyone in case the evil scientist returns, and she has the perfect solution--she'll turn into a dragon, once and for all! With help from Ailis and Jasper, everything seems to be going according to plan. But what's that dark shadow slithering around the spellcasting range...?--Back cover.