What vision does Lucie have?

From the text:

Thus, the rustling of an Angel's wings got blended with the other echoes, and they were not wholly of earth, but had in them that breath of Heaven. Sighs of the winds that blew over a little garden-tomb were mingled with them also, and both were audible to Lucie, in a hushed murmur—like the breathing of a summer sea asleep upon a sandy shore—as the little Lucie, comically studious at the task of the morning, or dressing a doll at her mother's footstool, chattered in the tongues of the Two Cities that were blended in her life.