Since you feel an egg, you can soak her in a warm pan of water for 10-15 minutes, massaging her belly gently. The relaxation can help her pass the egg. Give her a Tums, or a human calcium tablet in the back of her throat or crush into a bit of yogurt. Egg shells wizzed in a food processor would be a good substitute. Then offer her a few drinks of water. If she doesn't pass the egg, place her in a warm and humid room (a bathroom after running a hot shower is good.) Egg binding can be a result of too little calcium, dehydration, or too large an egg. Sometimes a rubbery egg can stick as well. Here is a good article about egg binding: http://www.the-chicken-chick.com/2012/07/chicken-egg-binding-causes-symptoms.html
