Deadly Nightshade - The Dreamer Chronicles, #2

A month after her fight with the dragon that put all of Grey Haven to sleep, Julie is kidnapped by a mysterious woman with uncertain motives. The only sure thing, as she battles nightmares, shades, and the reality of her present, is that she will have to depend on Carrie, Tommy, Ben, and Sully to save her before it's too late. But betrayal is closer than she knows, and unraveling why she was kidnapped will throw everything she knows about the people closest to her out the window...
If she can survive the poison that is keeping her tethered to the dreamworld. Deadly Nightshade is the second book of The Dreamer Chronicles.