The Girl With The Invincible Blood. The Dragonwitch Chronicles, #2

A girl reborn. A sinister weapon. After Elara Everly's death in battle, she's revived with magic from a powerful witch and dragon. With King Angus dead, his son, Fergus, has taken his title-and rules with an iron fist. Hating the dragons and witches with a vengeance for taking his father, he vows to take King Angus' plan one step further and kill all the dragons and witches. Since Elara's been gone, she realizes everything has changed-her friends have moved on, tempted to practice evil magic-and the world is different than she remembers.
When King Fergus steals invincible weapons from a powerful group of orcs, he seeks to unleash them on the dragons and witches-who can't defend themselves this time. After Elara realizes the key to stopping the weapons is in her magical blood, she has to return to the fight-and assemble another army to stop King Fergus' warriors called the Bloodslayers. With friends becoming enemies and an even more ruthless King out to kill all the dragons and witches, the world needs the Dragonwitch more than ever. Book Two of The Dragonwitch Chronicles trilogy