Her magical reserves are so massive that the leftovers are split into a holy beast she named Blackie lest she get killed from it. This stopped being a problem after season 1 since she absorbed Blackie. It's also hinted early that her magical reserves are the reason why Diana passed away in childbirth, because her body couldn't handle the strain.
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Book Of Randomness | Who made me a princess
RandomIt's about who made me a princess.