Answer:
Annabel Lee died because the angels were jealous of her and the speaker.
Step-by-step explanation:
Edgar Allen Poe's poem "Annabel Lee" revolves around the tragic death of Annabel Lee, the speaker's love who was taken from him. The poem, as is often seen in Poe's other works, deals with themes of death of the beloved woman, and the sadness of the person left behind to deal with the heartbreak.
As given in the excerpt, the speaker reveals how Annabel Lee was taken from him. He reveals how "The angels, not half so happy in Heaven, Went envying her and me— Yes!—that was the reason". This is the reason why Annabel Lee died.
Thus, the main idea of this part of the poem is that she died because the angels were jealous of the love between the speaker and Annabel Lee.