The little boy represents a mental aspect of your wife's mind and a particular idea that she is using. The young boy, indicates thinking that is innocent but very lacking in adult knowledge. Being dirty would imply having an idea that is incorrect. The homeless impression implies using an idea that is not protected by a well established belief system.

The dreams suggest that she is letting such an idea "run away with" her. i.e. letting herself go too far with it. By pursuing this idea it may be leading her to put a focus upon the issue of death (the tomb).

By not saying a word to her she is being shown that there is nothing to be said for this idea i.e. there is nothing to recommend it.

Fire behind her implies fire from the past. The fire itself represents very emotional and destruction thinking - illogical thinking in the past. If your wife is very spiritual, the fire might also suggest the idea of hell fire. [Were her childhood caretakers spiritually inclined?]

[Mental illness is the result of allowing the wrong ideas to dwell in one's mind. This is why dreams are so useful. If she is very God fearing your wife should realize that she cannot put her faith in spells and still honour God. One has to chose. Scripture does not accept the use of spells, only Satan does. The little boy in her dreams might easily refer to the idea of spells because by following the path of spells she would be taking herself to the tomb - since she is not following God's path. Hope this might be helpful to you.]