setalleanan2

* She's not at all unsettled by being held by the Power [ACoS, 383]
* She knows far too much about Aes Sedai, and throws around Aes Sedai terms far too naturally for her to have had no contact with Aes Sedai.
* She allows the Kin to be defferent to her, even though some of them are much, much older than her.
* She is not scared of Aes Sedai in the least, and goes so far to bully one around.

4. Anan was at the Tower seventy years ago when Garenia/Zarya was a novice. If Anan was only a failed Novice or Accepted, as Elayne supposes, then Garenia would not fear that she'd turn her in, and Reanne would not be so dererential to her, so Anan must have been Aes Sedai. Something happened to burn her out, and she completely lost the ability to channel. She moved to Ebou Dar and got married about 20 years ago, since Anan has grown children.

5. She is familiar to an Aes Sedai. Joline Maza Sedai questions her, asking "Have we met somewhere before? Sometimes, when I cannot see your face, your voice sounds familiar [WH: 29, Another Plan, 556]."

6. She has an idea that she can become sul'dam... "Not every woman can be a sul'dam. You should know that by now. I have some hopes that I can, but better we find out before the last hour [WH: 556]." What makes her think that she can be a sul'dam? Because she used to be able to channel? But we find out that she can't...

So, if Setalle Anan was once an Aes Sedai, then who was she? In The Path of Daggers, Vandene Sedai mentions a certain sister, Martine Janata, who burned herself out: "She was the last sister to really make a business of studying ter'angreal... She did it for forty years, almost from the time she reached the shawl... Then one day, Martine's maid found her unconscious on the floor of her sitting room. Burned out... That was more than twenty-five years ago... She vanished once she was well enough to slip out of the Tower... [TPoD: 2, Unweaving, 73-4]."

The timing on this matches:
1. Setalle gave birth to her first child more than twenty years ago [ACoS: 405], and Martine Janata was burned out twenty-five years ago.
2. Martine Janata was raised to the shawl about sixty-five years ago, and Garenia/Zarya Alkaese ran away from the tower seventy years ago.