Little Giant-Big Trouble: Dragon Slayers' Academy, Book 19

Something BIG is going on in the woods near DSA! Wiglaf and his friends are on a rescue mission to save Worm, the dragon they've raised since he hatched. They thought that a gang of knights-in-training was the problem, but it turns out that it's a little girl GIANT! The DSA kids can't let Worm become her house pet. But how can they free him?