I have a theory that Nynaeve and probably Egwene and Elyane are Aes Sedai from the Age of Legends Reborn. I say this because the AS kept remarking about how potentially strong they were in TGH and because Nynaeve is a match for Moggy who I might add is the wimpiest villainess in WOT. Since every age of the Wheel comes again I think that this brings up the idea of reincarnation not only in the case of Rand, but Nynaeve as well. Why else would she be so strong?