Honestly, I feel that it makes perfect sense for Egwene to die in this book. I've never really been that great at reading into foreshadowing in novels, but I know that there has been talk of how Egwene and Rand are counterparts in terms of the novels. This was noted upon when TGS was released and they almost split the novel down the middle. Both had to grow into their own power and positions of authority and both did so in very different ways. I always liked Egwene, but she did start out a little annoying, but she evolved over the course of the novels, just as Rand evolved in his own way. I feel like because the two were so intertwined in this way, when Rand was given a reprieve from death at the end of the novel, although he was destined to die, Egwene had to die. There had to be a monumental cost associated with winning the last battle, and if it wasn't going to be the Dragon reborn, it had to be her. I have to say that her death scene was very well done, and very fitting for the character.