Why does Pearl insist that the scarlet letter be replaced?

This occurs in chapter 19. Literally, Pearl requests that
the letter be returned to Hester's chest because it is a familiar piece of her mother
that makes her mother identifiable to Pearl. It is a part of Hester's
identity.

This incident is so strange because Pearl gives
Hester great affection when the letter is replaced and she even kisses the letter on
Hester's chest.

Figuratively, Pearl is representative of
evil. She has been referred to as a devil-child throughout the text. The evil in her
does not want the shame and guilt of what occurred to Hester to be removed. She wants
Hester to be forced to keep living with it. This greatly pains
Hester.