Is she standing on her nose? She could have swim bladder disease which would explain her bloat. Fast her for a couple of days and then offer her a blanched, peeled pea. You can also place her in an Epsom salt bath to pull off fluids and help with constipation. Take one gallon of dechlorinated water at the same temp as her tank. Add one teaspoon of Epsom salt (not aquarium salt). Make sure it is pure Epsom salt with no fragrance added. Place fish in bath for 3 minutes. Then place her back in tank. You can do this 3 times a day. Good luck! Note: If she is in with other fish, I would put her in a quarantine tank.