Daring Strength

A wild tiger invades the land of Narnia, killing anyone in his way. His teeth were as strong as iron bars, thus called the Bartiger. Verity and her brothers set out to hunt the creature until Susan forbids her when the tiger seems for of a threat. Going against her sister's orders, one day Verity goes out in the woods. She comes face to face with the tiger. Climbing up a tree, but the tiger follows her and attacks her from the tree, only getting her leg, as Peter and Edmund come to her rescue. She was injured with a temporary paralysis, but the problems get bigger, by her fear of the woods, which turns into trauma. Aslan instructs her to face her fear and kill the bartiger, who is in Archenland, by then. However Verity's hunting skills are amateur. She and her brothers head to the border of Archenland and Narnia, where an old hunter lives, who can help Verity. Archibald Chase, the only man with a gun in that world.
Most of the rights go to C.S. Lewis and Disney