Where are you getting 600mg? That seem like a lot even for a human. It can constipate a human if taken in large doses.She does have the signs of egg binding. Give her more calcium. What type calcium is it? Carbonate, citrate, or gluconate? What is the strength? It needs to be around 600mg to be effective. It must be given directly into the beak and not diluted.
Egg binding causes changes which affects fluids in the body, causing dehydration. So make available plenty of water. She needs to be in a quiet place where she can relax with no stress. Hold off on any further soaks for now. Just allow her to rest quietly.