The methylene blue will help her breath easier. It is also a good antifungal and swim bladder therapy. Salt the hospital tank at one tablespoon per five gallons. There is the possibility this could be renal failure or a kidney inflection. Bath in MB twice daily for 30 mins at 1teaspoon per 5 gallons. This should help her. Keep the bath water the same temp as the tank water. Keep her calm and tank dark.