Reeder, Amy

"Teenager Amy Winston lives a second life in the magical realm of Gemworld, where she is known as Princess Amethyst. . . When she tries to return to Gemworld to celebrate her 16th birthday in style, she discovers that the Amethyst Kingdom is missing! Her subjects have vanished, and no one in any of the neighboring lands--not even her best friend--remains loyal to her house. Left alone and dejected . . . , Amy must find new allies and confront dark secrets if she is to restore what's been taken"--.

After Lunella teleports a dinosaur and evil humanoids to the middle of her gym class, the big dino whisks her off to the city, but when she thinks she's safe, the Killer Folk kidnap the super genius.

Lunella can't wait to study the Omni-Wave Projector she found, but when it's activated during gym class, it creates a time portal, bringing forth the savage Devil Dinosaur, along with the evil Killer Folk, who will stop at nothing to claim the device for themselves.

The Killer Folk have stolen the projector, but Lunella's mission to track them down is interrupted when a fire breaks out at school. It's up to Lunella and Devil Dinosaur to work together to rescue everyone inside.