There are 2 books in the Caitlyn Brown Series series. The newest book is Flight of Shadows which came out in 2010.

1
Broken Angel

Book cover of Broken Angel
Her birth was shrouded in mystery and tragedy.
Her destiny is beyond comprehension.
Her pursuers long to see her broken.
She fights to soar.

In the rough, shadowy hills of Appalachia, a nation carved from the United States following years of government infighting, Caitlyn and her companions are the prey…
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2
Flight of Shadows

Book cover of Flight of Shadows
Her genetic secret could change humanity forever.
Her DNA grants her the ultimate power. 
But all she wants is to disappear. 

Looming buildings rise into the sky of a near-future America, shadowing the desperate poverty of the soovie parks, death doctors, and fear bombs. In this world of walled cities,…