No final do Quenta Silmarillion é mencionado que Elwing e Earendil foram aceitos para viver em Aman após a Guerra da Ira. Earendil passava seu tempo fingindo ser uma estrela, enquanto Elwing esperaria por ele em sua torre:
Therefore there was built for her a white tower northward upon the borders of the Sundering Seas; and thither at times all the sea-birds of the earth repaired. And it is said that Elwing learned the tongues of birds, who herself had once worn their shape; and they taught her the craft of flight, and her wings were of white and silver-grey. And at times, when Eärendil returning drew near again to Arda, she would fly to meet him, even as she had flown long ago, when she was rescued from the sea. Then the far-sighted among the Elves that dwelt in the Lonely Isle would see her like a white bird, shining, rose-stained in the sunset, as she soared in joy to greet the coming of Vingilot to haven.
(Quenta Silmarillion, capítulo 24: da viagem de Eärendil e a guerra da ira)
Então, seu palpite está quase correto. Ela não mantinha sua forma de pássaro, mas os pássaros a ensinavam a voar (e aparentemente a criar asas), e ela se sentava em sua torre e esperava que Earendil voltasse de seus deveres brilhantes como estrelas e voasse para se encontrar. ele.