How does Lady Macbeth's character change throughout the play?

Lady Macbeth's character changes remarkably throughout Shakespeare's Macbeth. At first, she seems more confident in the murderous scheme than her husband, goading him to kill Duncan and staying calm when Macbeth panics. Then, afterwards, it seems Lady Macbeth is responsible for keeping up appearances, as she reins in Macbeth when he begins to express feelings of regret or remorse. As confident as she is, however, Lady Macbeth's conviction eventually fades, and by the end of the play she has become a shade of her formerly ferocious self. Indeed, the guilt of her deeds eventually drives Lady Macbeth mad and, by the end of the play, she commits suicide. Thus, the evolution of Lady Macbeth's character is a dramatic one, as she effectively crumbles under the strain of her own ambition. This evolution can also be contrasted with Macbeth's own progression, as he seems to regret his part in the murder of Duncan more immediately than his wife.