Who is Birgitte from Lord of Chaos and what is their importance?

Birgitte is the embodiment of a legend, an archer of the previous Age, who was known for her extraordinary skill with the bow, as well as her battle prowess. She is one of the storied Heroes who will answer the call in the Last Battle to fight alongside Rand. Birgitte is found by Elayne and Nynaeve in the Dream World. She is described as headstrong, independent, and quick to speak her mind.