She looks a little over watered. Watering should be every 5-7 days for the amount of energy used. The problem here is that you are not letting the roots fight for that last drink of water. You want the soil in the bottom of the pot to be dry before watering it again. The roots will never find their way to the bottom of the planter if the top soil stays wet. The roots are on a a single mission "Water" Let it dry out a few extra days then water it. Marijuana a.k.a. (WEED) is a resilient plant. If it looks dry and droopy, add water. Within 2 hours of adding water it will perk right back up.

1 other thing you can do to help weather stress, is buying some kind of Silica supplement. I prefer Botanicare's: Silica Blast.Attachment 283563 "Silica Blast Plant Bio-Mass Yield Enhancer is a beneficial nutrient supplement aimed to strengthen plant tissue and be used in conjunction with Botanicare's nutrients or your preferred standard nutrient program. Silica Blast is ideal for use in soilless container and hydroponic applications as well as soil applications. The silicate in Silica Blast helps the formation of a sturdy silicate matrix in cell walls. The strengthened cells result in reduced transpiration rates and allows plants to continue photosynthesis under stressed environments."