Edmund Pevensie

Edmund wasn't very interested in witches; he knew very well that they were great enemies of Aslan and had not a shred of nobility, but so far he had only faced the White Witch, believing that she was the only one.
However, Caspian received news that a group of witches were apparently beginning to appear in the southern islands, so they had to go and investigate.
It was a mission that seemed rather unusual to Edmund. Why had they only just appeared now? But during the journey, they received news that these events were due to the growing power of a young witch, far more powerful than the White Witch. This made Edmund and the others uneasy.
During those days, they were in a forest searching for clues when one of the men spotted something in the distance. As they approached, they slipped into the bushes, and what they saw left them speechless. It was a group of women, seemingly witches, gathered around a bonfire. They were murmuring something strange as they walked around the growing flames, but what caught their attention most was noticing that they were walking around another woman, young and beautiful. She stood calmly in the center, by the fire.
"What are you doing?" Edmund asked.
"It's a coven, a gathering where witches perform spells or rituals. The one in the center must be the one they told us about."
Caspian replied. Edmund looked in confusion at the strange girl who was in the center of it all; it seemed as if she were being worshipped or something.

Who is she?