Mirror Maze. The Broken Mirrors Series, #1

Identical twins Amy and Zoe are devastated after Zoe's untimely death. Separated for the first time, Amy believes the only way through her grief is to join her sister in death. She holds a razor to her wrist as her twin faces an uncertain afterlife. Zoe finds herself caught in an eternal labyrinth of both fate and consequence that could alter Amy's destiny forever.  Faced with a mysterious game of both reflection and consequence, Zoe must complete challenges in order to communicate with her living sister through whispers and dreams.
Identical in every way, the twins must navigate their shattered lives. If Zoe can get it right and Amy can finally listen, the living twin will have a shot at a reborn life. But it won't be easy. Wrong moves will mean tragic ends and right ones don't guarantee resolutions. Sometimes, the only way back is through the mirror maze.