Cinder by Marissa Meyer (2013) Square Fish

A futuristic take on Cinderella set after a World War IV and interaction with a human/lunar hybrid that uses the ability to detect and manipulate the electrical energy from emotions.  The lunar queen, who killed her sister to gain the throne, is demanding the hand of the earthly prince of the Eastern commonwealth or threatens war.  In the meantime, a broken child was rescued and is now a cyborg.  When her new father brought her home, his wife and the oldest sister was not happy.  Especially when he suddenly dies from a highly contagious plague.  Cinder is an excellent mechanic, and the prince brought her an android to fix.  It holds secrets that could shatter the fragile peace keeping war from starting.  But the biggest revelation could change everything.