The Girl Who Has Already Died by Alessa Winters

For her entire life, Alette’s lived in her Aunt’s shadow. But now she has to fix her Aunt’s mistakes.
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After the wreckage caused by the aftermath of the battle between Demon Terese and Alette’s Aunt Frisse, magic hasn’t been the same.
Things are broken, the very lines of power running through the land are disrupted, and Alette’s home is crumbling around her. Her best friend is wounded, his power stricken from him. The ruling College of Magic sends a sinister acolyte to sanitize the magic, strip it from the land to save the world and Alette…Alette finds herself spinning in place. Unable to move forward.
Until one night, a mysterious, handsome stranger stops her, and offers her a deal. He can both stop the damage and save the magic of the region, but it’s risky. And he will need Alette’s unique abilities–a magician who has come back from the dead.
But she will need to contend with the College’s plans–and her own Aunt’s last wishes.