The Skalterra Duology By Nightmare

Wren Warrender wants nothing more than to get off the waitlist at her dream school and survive the summer with an insufferable new coworker, so when a group of Magicians drag her sleeping consciousness into a magical realm called Skalterra to act as their weapon each night, she's less than thrilled.An old evil is breaking free of his glacial prison, and now it's up to Wren to keep him from unleashing chaos across two separate realities. The lines between waking and sleep start to blur, and Wren is forced to reckon with the fact that some bad dreams are more than Nightmares.