When the Savior went to heal Jairus' daughter, he said the same thing, she is not dead, but sleepeth (Lu 8:52). The Savior, by so saying, was not indicating that her spirit had not left her body, but that she would rise again. This is apparent from the language he used to describe Lazarus (Jn 11:11-14). Lamoni, on the other hand, is not "all dead" just "mostly dead."