Forced Me Out for a Mistress? Now I'm the Elven Queen

After her husband fakes a ruined sacred spring to drive her away for his mistress, Ada signs a divorce that leaves him with every debt. She secretly makes the spring truly collapse, escapes with her ancestral magic array, and saves a wounded stranger. When he returns as the Elven King, Ada exposes her enemies, saves the empire, and rises from discarded wife to powerful Queen.