The Aurella Trilogy

Aurella found out she's a witch... just in time to start a witch hunt. Twelve years ago, the kingdom of Dovice was purged of magic. All the witches were killed in a massive witch hunt, and evidence of their existence was erased from history. So when Aurella discovers she's a witch, she's both confused and frightened. Despite the risk of revealing herself, Aurella uses her powers to protect her only friend from a dangerous situation and accidentally sets in motion another witch hunt, making her the key target.

Aurella and Mavic have escaped a witch hunt in Dovice, only to discover that Rashtica has also been corrupted by a wicked king. Unlike King Slathgar, this king doesn't kill powerful people but collects them for his army. No one is safe from forced recruitment, not even children. Though Rashtica is full of witches and warlocks, magic is rarely done in public for fear of being spotted by one of the king's knights and forced into servitude.