I googled it and found another person who had said their quail was turning it's head upside down and spinning in circles..... A bird vet answered this way:
"One possibility of what may be going on is avian encephalomalacia (vitamin E deficiency). It happens when fats in the diet go rancid or a vit E deficient diet is fed. Treatment is by supplementing vitamin E and selenium in the diet.
Other possibilities are out there, of course, such as avian encephalomyelitis (a viral disease), rickets, vitamin B deficiency, Newcastle disease, eastern encephalitis, Marek’s disease, and encephalitis caused by a variety of pathogens.
If you have other quail, make sure they are being fed a good quality food mixture. I would recommend adding vitamin E and selenium to the diet, which you should be able to find where you buy your feed or a veterinary supply source. A good physical exam and diagnostic tests by an avian veterinarian would be an excellent idea to try and find out if this is more than a vitamin deficiency. If this bird doesn't make it, I would strongly recommend sending her in for a necropsy so they can find out what happened so that you can prevent it in the other birds. "