Right before this happen I was going to ask for help on the same quail about it’s vision because when I give treats the quail run toward my hand and start pecking the food but when this one come it peck at the air near my hand like if it needed glasses it will take few second till it starts eating from my hand.
You may have a bird with multiple genetic and/or hatching defects. Right now, it's a neurological issue, all of the symptoms can be caused by a severe hit to the head, or vitamin/mineral deficiencies of the parent stock. Time will tell whether to let it be or to cull....I certainly would not want to breed it.