Is it ever explained who or what determines when a novice/Accepted is ready to be Tested?  With all the "The hour waits on no woman" and "The Wheel Weaves as the Wheel Wills," it almost seems like some outside force chooses the timing, or maybe something about the women themselves causes the Testing to be imminent, like a biological or magical alarm clock going off, for lack of a better term.

Is there any place in the books that actually mentions whether Moiraine returns to the White Tower after her initial departure in New Spring?  I suppose she'd have to at least once, to acquire Lan's Warder cloak and the angreal she uses to Heal Tam in The Eye of the World.  I just can't remember any actual mention of a visit.