Mirage by Somaiya Daud #1

–  In a star system dominated by the brutal Vathek empire, eighteen-year-old Amani is a dreamer. She dreams of what life was like before the occupation; she dreams of writing poetry like the old-world poems she adores; she dreams of receiving a sign from Dihya that one day, she, too, will have adventure, and travel beyond her isolated moon.

But when adventure comes for Amani, it is not what she expects: she is kidnapped by the regime and taken in secret to the royal palace, where she discovers that she is nearly identical to the cruel half-Vathek Princess Maram.