Wilted branch, on my girl

I have a 6ft tall sativa, planted in the ground. She is 2 weeks into flowering. She looks great except this morning I seen the flower top of the lowest branch slightly wilted. I went and checked her out this evening and the whole branch is wilting. All the rest of the plant looks great. It is just one branch. 3 days ago I gave it half strength MG Bloom 15-30-15, I didn't soak the ground much just a light shot. I didn't folage feed. It rained that eve just enough to wet the ground good. So I waited a day and watered a little deeper. She hadn't been fed for 2 months. What do ya all think could be the prob???

Occasionally a plant will self prune a lower branch for no visible reason. You might check the joint where the branch joins the stalk for breakage or fungus. Occasionally a foreign object will lodge at this point and create a weak spot, but this is rare. Try misting the leaves several times. If it doesn't improve, let nature take its course. The plant will salvage what it can from the branch, so consider leaving it until it's dead. If more branches start to wilt, PM me, because then something else might be happening. Pix are always a plus.

Thank you so much. I will get pics in the morning if it dont improve.