Magic's Guardian: Enchantment's Endgame Book One (Volume 1) 2nd edition

Shakespeare had it mostly right. Faeries do exist, though he missed part of the story. When Terraceleste, a girl who thinks she's normal and probably more average than most, encounters the Seelie Court of Faerie during a solitary camping trip, it seems she might not be so average. But when she is forced to leave Faerie Underhill and loses her memory of the life that felt so right and the love she found with an honest-to-goodness Faerie Prince, she is left haunted by the feeling something precious has been lost. When a not-so-chance encounter brings it all back, she steps once more through the Faerie Circle. Burdened by memories she would rather not have, she is sent on a mission to save the children of this world, and perhaps the entire Seelie Court. With her companions Prince Maclyn, Puck, and Healer's daughter Rosebud, she discovers that her life has never been destined for average. But it could cost them all more than they can pay. Some adult themes, mature audiences.