Sure looked like a neuromuscular problem yesterday. Frightening watching her right arm stiffly bent at the elbow with palm facing out behind her back. The gentleman assisting her had to pry her arm out. Her legs did not have purposeful movement, quite stiff. This was not a fainting spell, and it did not appear to be jelly-legged weakness. Looked more ominous.
It really looked like a vasovagal to me. She has an inability to stand because she is, imo, having frequent vasovagal attacks.