I had a RIR that would molt in the coldest part of every winter. We had weeks on end when the temp was below 0*F. She looked like she belonged in the poultry case at my local Hannaford store. In spite of the cold and her nakedness, she came through molt just fine. They are far more...
Pick up some Poultry Nutri-Drench. I'm guessing she does not metabolize her vitamins as well as the rest of your flock. Her system is stressed right now, and this is why you are seeing an underlying weakness present it'self right now. You can give this to the entire flock in their water. If...
In this summer heat, I would not give them magnesium chloride. Just give them the vitamins in one waterer, and plain water in the other. HOWEVER, vitamin water needs to be changed daily. It goes rancid very quickly. You can get a bottle of Poultry (or sheep) nutri-drench, and give her a few...
You might try giving her Nutridrench. I also have a pullet who does this, usually just in the morning, and only for a few seconds. Had a chick who had what is called wry neck, with the backwards walking. I brought him back from comatose to acting normal with electrolytes, probiotics...