There are 3 books in the Splintered series. The newest book is Ensnared which came out in 2015.

1
Splintered

Book cover of Splintered
A descendant of Alice Liddell, the real-life inspiration for Lewis Carroll's Alice's Adventures in Wonderland, 16-year-old Alyssa Gardner fears she is mentally ill like her mother and predecessors until she discovers that Wonderland is real and, if she passes a series of tests to fix Alice's mistakes, she may be…
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2
Unhinged

Book cover of Unhinged
Alyssa Gardner has been down the rabbit hole. She was crowned Queen of the Red Court and faced the bandersnatch. She saved the life of Jeb, the boy she loves, and escaped the machinations of the disturbingly appealing Morpheus. Now all she has to do is graduate high school. That…

3
Ensnared

Book cover of Ensnared
After surviving a disastrous battle at prom, Alyssa has embraced her madness and gained perspective. She's determined to rescue her two worlds and the people and netherlings she loves. Even if it means challenging Queen Red to a final battle of wills and wiles . . . and even if…