It has to be one of the Aes Sedai that stayed at Queen Tylins palace, And I think I remember one of those being named Black by Alviarin.. but that was Elaida's Aes Sedai, not Egwenes.... interesting... This came to me last night, just thinking about it. My personal Choice for who is the BA with Elayne... Is Vandene! Who else could get so close? She also knew that Adelas liked sweet tea. The only problem with this is that Vandene has a warder, and there have been many theories, and discussions on whether or not Warders can sense if their Aes Sedai are darkfriends or not. Another option is that Adelas was the BA, and by orders, or by fear, she killed Ispan, and commited suicide. Ispan may have uncovered the fact that Adelas was BA, and threatened to expose her if she kept torturing her... Adelas freaked, killed Ispan, and then killed herself, because there would have been no explaining how Ispan died, and Adelas did not. Either way it goes, One of those two is BA, only by the other finger pointing at them... Chapter 22 in The Great Hunt, Moiraine was visiting Adelas and Vandene, and A Warded Draghkar attacked... Vandene was with Moiraine, so maybe Adelas warded the Draghkar??? one of those two are BA, there's no getting around it.