Magic is the most powerful Witchcraft that will be commonly seen in the modern era, but they are still rare with the Madison Coven having only three witches out of their three dozen strong coven having some kind of elemental abilities. What sets apart magic from spell casting is that magic does not require study to use, although it requires practice to master. Magic is an inherited ability passed from parent to child. Elemental abilities are inherited from the mother and father, while more specific abilities such as telekinesis and the ability to see ghosts is inherited from the mother only as the root of these abilities come from the mitochondrial DNA which is only passed from mother to child.
If more specific abilities like telekinesis, the ability to see ghosts etc. can only be inherited from the mothers side of the family, how could Diana inherit her fathers timewalking ability (among others) and not only his elemental ability (water)?