Fae Fair: A young adult portal fantasy - Lost Princess of Starlight, #1

A magical world. A bewitching fair. An impossible promise. Zoe longs to escape her bullying foster brother, but when she takes her horse for a ride and accidentally crosses into faery, all she wants is to return home. That is until she is hailed as a long-lost princess. But in faery, the forest is constantly changing and dangers lurk around every corner. When Zoe's curiosity leads to the capture of the one friend she has made-the enigmatic Guardian of the Gates-she becomes bound by an unwinnable bargain to the Queen of Dawnlight.
Then there's Prince Florian. Aloof and scornful, but irresistible, he knows more about Zoe's past than she does. He may be the only one who can help her fulfil her promise to the Queen-if she can persuade him to help. The magical fair in the centre of the forest may hold the answers Zoe seeks. But as with everything in faery, the fair may not be quite all it seems... Fae Fair is the first in a new clean series for lovers of fae, epic fantasy, and magical bargains.