From the Darkness Comes - The Darkness in the Midst, #1

Revenge is not for the faint of heart. Cadda ni Caridos is a revenant who desires nothing more than finding the man who made her that way - the same man who killed her father and captured her mother. The glowing eyes, night vision, incredible strength and speed that came out of resurrection might seem like a boon, but when she can't control her abilities and starts bringing death to others, she realizes it's a curse.
Cadda must dodge the authorities while searching for her father's murderer, a man who turns out to be a powerful duke, and the only person to know the fate of her mother. Always one step away from the king and his elite order of bodyguards, Lord Kenric Dorsile is near impossible to get close to, especially for a lowly foreigner like Cadda. While scheming a way to do just that, Cadda is finally caught by the authorities.
Being conscripted into the army as punishment and sent to the far edge of the kingdom to defend against barbarians - the enemy of her enemy - proves to be a mammoth of a challenge. Cadda must find a way to return to the capital, even if that way includes personally fanning the flames of war. Otherwise, she risks losing her mother forever and forfeiting the right to avenge her father and herself.