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

Bera is an Aes Sedai. She takes a co-leadership role in the Salidar embassy to Rand, along with Kiruna. Bera is described as a blustery, outspoken bully. When an Aes Sedai as stubborn as her is forced to kneel to Rand, it is a clear sign that Rand is well on his way to ally all Aes Sedai to him.