Originally Krishna’s energy is one; spiritual energy. But according to different functions, Maya is represented differently. In the material world the energy is called Bhadra, and in the spiritual world the same Maya is called Subhadra. Su means auspicious. So in the spiritual world, the same Maya works auspiciously, and in the material world the same Maya works inauspiciously.
Letter to Upendra, July 5, 1969