The Marquise's Revenge

A woman transmigrates as a disposable character whose husband abandons her at the altar for his first love, then abuses her to clear the way for his beloved. When he orders her to be imprisoned and left for dead, she snaps — and marries his uncle instead, becoming the hero and heroine's aunt. The 'divine healer' heroine? She revives patients the heroine can't save, stealing her thunder completely.