Sorry for bumping an old thread, but I did a search for Tinna as it wasn't revealed who she was in the book. At first I was sure she was Morgase, particularly from the description she had as unique looking and with an air of authority (then again that's basically how all woman in WoT are described). But then she was mentioned later in Mayene I think it was? Either way, for some reason Tinna was at the back of my mind the whole book and I want to know what's with her!... and Nakomi of course...I think Tinna is just a random woman, Toral, that was put out of the Tower and still wanted to be useful. The Last Battle called many dudes/dudettes from all callings to action it seems. I would also theorize someone named Tinna (or many Tina :P) either is close to Sanderson or won a conetst or another and was placed in the novel.