A City of Emeralds and Envy by Rebecca F. Kenney

Following her departure from Faerie, Alice tries to adjust to the rhythm of her old life. But confusing emotions draw her into a new venture with Dorothy, a girl from a neighboring farm. When the pair are transported to a whole new part of Faerie, Alice encounters former acquaintances who, like her, haven’t moved past what transpired in the Unseelie kingdom. With a new, powerful enemy fixating on Dorothy, and with trauma evolving into trust, Alice must decide if she can afford to risk her heart… again.