Carenna is an Aes Sedai of an unknown Ajah. She allied herself with the rebels in Salidar.
When Nynaeve passes off a trick for eavesdropping using the One Power learned from Moghedien as her own discovery, Carenna picks it up with suspicious quickness. Nynaeave thinks that she, as an Accepted, can hardly accuse Carenna of having used such a trick before her 'discovery'.
Carenna says that she thinks the weave can be used to communicate with other sisters over long distances. This adaptation of the eavesdropping weave has not yet been seen, if it was successful.