She is a shy, withdrawn woman.
Aiden lied about her age when she enrolled as a novice.
She is one of the few Atha'an Miere sisters and works in the White Tower Library, along with Nyein and Zemaille, the other Sea Folk Aes Sedai. They tend to stay alone on the upper levels of the library with the secret records.
At the time of the Dragon Reborn's birth, there were four Sea Folk Aes Sedai in the White Tower, and two of them were almost 300 years old. It is possible that Aiden is one of them.