A Note on Foreign Affairs in the Spring Time

During the Southern Song Dynasty, scholar Qin Yi went to the Southeast Asia with a merchant ship. Unexpectedly, he was hit by a hurricane and ended up on an island. Among the primitive tribes on the island, there was a mute girl who turned out to be a Song Dynasty woman. What is the origin of the mute girl, and why does Qin Yi regret her for the rest of his life?