What is the source of the allusion in the sentence below?
From the look on her face, Belle is carrying an albatross around her neck.

 - Egyptian history
 - a poem
The source of the allusion an albatross around her neck is a poem.
In Samuel Taylor Coleridge's poem "The Rime of the Ancient Mariner," a sailor shoots and kills an albatross, an action that curses the ship and crew. As his crew members die, the Ancient Mariner feels his guilt hanging like the albatross around his neck.
The allusion an albatross around her neck means a burden a person must bear.