Along with Lord Abelle Pendar, Lord Pelivar Coelan, Lady Ellorien Traemane, Lady Aemlyn Carand, and Lord Luan Norwelyn, she supported Morgase Trakand for the Lion Throne during the Third Succession War.
Despite her support for Morgase, she was exiled from Caemlyn along with many others major lords, while Morgase was under the influence of Lord Gaebril. As a result, Arathelle supported Dyelin Taravin for the Lion Throne for a time.
After the death of Rahvin she was invited by Rand in the Royal Palace and Lady Arathelle meets with the Dragon along many other major Lords.
She leaves the border of Murandy and heads near Caemlyn, where she sets up camp with Abelle, Luan, Ellorien, Aemlyn and Pelivar. There they sit to the side and stay neutral during Arymilla Marne's siege on Caemlyn against Elayne. When Arymilla's force is defeated a message is sent to Elayne asking for safe passage in Caemlyn for the neutral High Seats.
They meet with Elayne and Luan asks for a temporary alliance with Elayne's forces to fight against the Borderlands army in Andor. Elayne reveals she invoked her right as an Aes Sedai and allowed them safe passage across Andor into Murandy to keep looking for the Dragon Reborn. Luan and then Abelle throw their support behind House Trakand. Arathelle, Aemlyn and Pelivar also throw their support behind Elayne, but only for a speech in her favour by Dyelin. This gives Elayne the required amount of Houses to obtain the Lion Throne.