If you're feeding her high protein food, you might find something closer to 20% protein. Adult quail don't need as much as chicks.
The other option would be to take her to a vet.
Those nails are long enough to be causing some limping. They need to be trimmed. You may consider adding a brick or something rough to her pen. That way she can wear her nails down so you don't have to trim them after you've gotten them into shape.