Who is Peggy from Red Prophet and what is their importance?

Peggy is a young girl, just a little older than Alvin. She is a Torch, and has been all her life. She was present when Alvin was born, saving him by removing the caul that still covered his face when he was born. This act created a link to him that would last a lifetime. She had merely to think of him and she can see his heartfire and all of his possible futures playing out. From the moment of his birth, she had watched him, helped him where she could, and saved his life on many occasions.