IMO, there are a number of rulings that may allow "Control Weather" (A) to supersede "Control Winds" (B):
Reason 1: (A) is of higher level than (B) - although this reason is kind of meh...
Reason 2: (A) is cast afterwards, so, by resolving the stack of effects by the order of events, (A) "wins" (i.e. same as resolving a poison affecting STR and then cast with a "Bull's Strength" to recover; if it was the other way around, the poison would "win")
Reason 3: (A) affects a greater area for a longer time, so it would, at least, suppress the effects during that period. If cast after (B) - following Reason 2 - then this is a no-brainer.
So, if I am reading this correctly, the Marzanna Hags could use their Control Weather abilities to "do away with" the control wind spells, but all it actually does is alter what the wind is doing, and it doesn't actually get rid of the control winds spell. So it would take the Hags 10 minutes for their desired change in effect to occur,...
Yes, this is correct.
... and then the caster of the control winds spell (assuming she is still around to concentrate on the spell) could immediately change the wind back to what she wanted, with no lag time (or even change it back after 1 of the ten minutes, when the wind force has dropped from Hurricane force to Windstorm force, for example), correct?
...but this doesn't sound right. IMO, the "Control Winds" would be suppressed by "Control Weather". The Hathran can try to control the spell as he wishes, but to no real effect. He may be able to sense that his control is being affected by another spell, of course (Spellcraft check?).
If the Hathran controlling the Control Winds spell is out of range, can her concentration alter the wind? What if she has left the range, but since returned?
I say NO and YES, respectively. The spell doesn't require a continuous concentration to work, so i wouldn't force the druid to stay in range of the spell the whole time. However, it stands to reason that the druid must move to a range where he's able to control his spell if wishes to change it's effects.
I hope this helps...