She was very tall and thin, with an angular face, a long chin, and curly hair. She has spidery fingers.
Shevan can be very dry at times .
Being a Sitter in the Hall for a time means that Shevan was also a high ranking sister and a strong channeler by Aes Sedai standards. Thus she has the strength needed to use the travel weave.
Despite the trend of too young Sitters, Shevan is the only one old enough to hold a chair and was very likely to go into the Hall even before the split.
Shevan was at dinner with Elaida and most of the other Sitters. Elaida wants to demonstrate her authority and insults her and the Browns. After Elaida began to taunt Egwene al'Vere and demanded her to stop telling lies about a Seanchan invasion on the White Tower. Egwene refused and enraged Elaida to the point where she used the One Power on Egwene, drawing blood and sending her unconscious.
Although not mentioned directly, Shevan can be assumed to stand for Egwene to be raised Amyrlin.
She is no longer a Sitter after reunification.