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

Coiren is one of the leaders of the Tower embassy of Aes Sedai who visits Rand, and eventually kidnaps him. She is very distrustful of men who can channel. Coiren is described as cold, severe, and calculating. She believes that Rand needs to be taught respect, be it with confinement, torture, stilling, or death.