Final answer:
The provided text contains themes of love and sacrifice represented by a nightingale. It does not offer information on the material the lady used to wrap the bird, and without further context, the correct answer to the student's question cannot be determined.
Step-by-step explanation:
The question asks about a specific detail in a medieval tale where a woman wraps a dead nightingale given to her by her husband. The text provided contains several references to nightingales and love, correlating with the themes in the tale mentioned.
Looking at the given excerpts, which are rich with symbolism and emotion, they evoke imagery of nature, love, pain, and sacrifice, but unfortunately, they do not directly answer the question about the material used to wrap the dead bird. The tale seems to symbolize the complexities of love and perhaps the sacrifices made in its name, with the nightingale character often representing true love or passion. Still, without more context or a specific reference, it is not possible to confidently provide the material the lady used to wrap the nightingale.