In The Hand Of The Goddess by Tamora Pierce
The book follows the journey of a young girl who disguises herself as a boy to pursue her dream of becoming a knight. Under the guise of her male identity, she navigates the challenges of knight training, battles with mythical creatures, and confronts political intrigue within the kingdom. With the protection of a goddess, she develops her magical abilities and forms deep friendships, all while keeping her true identity a secret. As she grows stronger and more skilled, she must prepare to face her ultimate test to achieve her knighthood while dealing with the growing threat of an enemy who seeks to overthrow the kingdom.