Left By Light (Stone Series #1) by CK Hart:
 
Unloved and unwanted, Katsia is left by her abhorrent siblings. Now she is alone with her estranged father, who, while still living at House Luz, abandoned her long ago.

All her life Katsia has suffered from what she believes to be a terrible illness. The Shadows have teeth, eyes, spindly fingers, and something to say. But is it insanity or something else that plagues her?

She will soon discover exactly what it is as she is plunged into a new world filled with secret organizations, Gods and Goddesses, friends and foes.

In the world of Stone, who can she trust?