The Magic Three of Solatia by Jane Yolen - Paperback

All magic has consequences

Long ago, the seawitch Dread Mary fell in love with a hard-hearted prince and gave him the Magic Three of Solatia: three silver buttons that could fulfill any wish—but at a price. Centuries later, the buttons belong to Sianna of the Song, a button maker’s daughter and heir to all of Dread Mary’s magic secrets. But the cruel King Blaggard of Solatia seeks to wed the lovely Sianna and steal her power. Sianna will need her wits, her magic, and the silver buttons to save herself and Solatia from the evil Blaggard . . . but what will it cost her?