Neverdark (Unabridged‪)‬

Warning: This book contains one very kick-butt faerie princess, an evil dark lord, a rhino-beetle named "Gor", dragonfly riders, bat brigades, and an extremely adorable, fluffy, pet firefly with anger-management issues.

From the blurb:

The faeries of Southnut are in big trouble. Lord Darkwater is up to no good. 

The white castle of Doru is under attack by the greatest army Princess Fiera's ever seen. Lord Darkwater is poised to crush her tiny kingdom unless the king gives her up to become his wife.

Well, fffungus! She's having none of that!

The race is on for Fiera to outwit Lord Darkwater's dragonfly riders, bat brigades, and even a giant, faerie - eating spider to save herself and, before it's too late, her whole world.