Using examples from the story, how could the sacrifice of the nightingale be treated as unnecessary?

In "The Nightingale and the Rose," it can be argued that the nightingale's sacrifice was unnecessary because the red rose (which she dies for) does not bring about the student's happiness. At the beginning of the story, for example, the girl tells the student that she will dance with him if he brings her a red rose. Having fallen in love, the student dedicates himself to this pursuit. By the end of the story, however, the girl has completely changed her mind about the student because she has met the Chamberlain's rich nephew and he has won her over by giving her some jewels as a gift. The need for the rose is, thus, negated because the girl has already found another boy to dance with.