Jinx specifies that it cancels a quick spell, so it wouldn't cancel any other kind of quick action, such as a quick attack or going on guard.
As long as the attack in the wand is a quick spell I would think that it would work, as the mage is the one casting the spell, not the wand. I'm not sure on it going back into the spell book, Jinx does say that it does, which would make Jinx much more worthwhile against mages that use wands.