Mistress of Fates by Luna R. Fuhrman

Revelyn Perric knows the price of a human soul—because she sold her own for wealth & power.

As the masked Mistress of Fates, she paints new destinies for Strelloc's elite, burying the trauma of her poverty-stricken childhood beneath sprawling palaces and chests of jewels. Once a starving girl, now draped in silk and diamonds, Revelyn has no intention of surrendering the life she fought for—no matter who pays the price.

But when her magic leaves a trail of devastation too great to ignore, the moon goddesses who gave Revelyn her magic turn on her. They place the Sycksal—the only weapon capable of killing a magic wielder—into the hands of Osweld, a gruff farmer with every reason to see her dead.

Desperate to survive, Revelyn disguises herself as a peasant to infiltrate Osweld's quiet farm life and steal the dagger. But amid the grueling labor and forced proximity with the man sent to kill her, Revelyn finds herself falling for the protective and unexpectedly kind Osweld and learning that wealth is more than jewels and gilded halls.

When the consequences of her past finally close in, Revelyn must choose: cling to the gilded life she's grown used to, or become someone new.

Even if redemption costs her everything.