She appeared the very day after Lucy's disappearance, to be sure; but that proves they are not the same person.

For Eliza is not demented.

She is a cold, hard woman of the world, in spite of her tender years.

She is doing the work of an experienced spy, while any deceit was foreign to Lucy's nature.

Instead of being plunged in grief Eliza is happy and gay, reckless of consequences and fully self-possessed.