Revenge as My Uncle’s Wife

She died with her unborn child, and it was her fiancé Kael and his sister Celestia who arranged it. She wakes up alive again, back before any of it. She breaks the engagement with Kael and marries Dravon, his uncle, a far more powerful man, because that is the position from which she can reach them. Kael will not let it go. He goes after her silver dragon and hurts it, he humiliates her in front of people, and on the night before her wedding he has her taken. She ends up chained inside a cursed arena where her magic is being drawn out of her and she cannot stop it. What comes up instead is an older dragon power that was in her blood the whole time. It puts everyone watching on their knees, and a ghost in the arena names her as something she did not know she was, the sacred Dragon Lord. She has two lifetimes of debt to collect from Kael.