She is a tall woman with silver-gold hair.
Guisin is relatively weak in the One Power. Her level of strength is described by "The Wheel of Time Companion" as 35(23) which is a quite low level in Aes Sedai hierarchy.
Guisin and Edesina are eventually kenneled with other damane in the attic of the Tarasin Palace in Ebou Dar, including Teslyn Baradon and Sheraine Caminelle, now known as Mylen. Afara was left behind in Tanchico.
Guisin adapts to the life of a damane. When Mat Cauthon asks Teslyn about the other Aes Sedai among the damane, Teslyn tells him that both Mylen and Guisin would report any escape attempt. Mat later sees all four of the Aes Sedai damane being walked by sul'dam.