your wilting plant needs more water. under watering during flower and wilting happens, cannabis love water, what i recomend is water until you see run off. now pick the pot and plant up. this is how much your plant should weigh at all times through out the growth, this way you do not over water or under water. by going by weight you will know when the plant is thirsty, it works out to be about every2-3 days that you water, having your grow medium dry it prevents the roots from spreading out, the roots are like a subway system, they travel looking for moisture, keeping them happy also keeps the top happy.
hope this helps