Tuon is a channeler, and even if she tries not to channel, she will slow in some way - Morgase can barely channel when she wants to, and there is quite a difference between her appearance and other woman of her age. Most likely she will encounter channeling sickness and may die like all untrained wilders, until she learns how to control it. Personally, I think this is the way that Egwene will play a role in neutralizing the Seanchan.