Do you have any calcium tablets or Tums at home? Calcium deficiency or dehydration can be a cause of egg binding. There also could be a large egg or lash egg blocking the vent. There is a possibility of the leg issues being related, but not always. If you do not have calcium, take a whole egg, cooked or raw with the shell on, and grind finely in the food processor or blender, and feed that to her. The egg shell has calcium in it. A tsp of plain yogurt can be given mixed in as well.