Eloise the Flame Dragon (Dragon Girls #16) -ER

"Three friends, Eloise, Ash, and Maya, have just discovered that they share an amazing gift. They can transform into powerful Fire Dragons when they travel to the Magic Forest. Once there, Eloise learns that she is the mighty Flame Dragon. She must lead Ash and Maya on an epic quest to a place in the forest called the Fire Realm, which only appears once every one thousand years. An evil queen is gaining power there. She must be stopped--and Eloise and her friends are just the dragons for the job!"--