That diet is completely inadequate. Gamebirds should be feed a balanced and complete ration of 24% protein.
A somewhat formed fecal portion with an extremely watery urine portion or excessive urate portion may indicate a kidney problem or metabolic problem. A more liquid consistency in the fecal portion of the droppings is suggestive of an intestinal tract infection.
Birds that are fed a ration consisting of seeds alone will result in the feces being watery and could have a yellowish to green color, depending on the species of bird. Although, in quail if the droppings are watery with yellowish urates, then IE should be suspected, along with loss of appetite, lethargic along with a 'ruffled' appearance.
After reading your other posts, I now suspect your bird is slowly starving to death.
Along with her weakened condition, an infection or disease can quite easily take over and overwhelm her immune system.