Sometimes bones are able to go through the system or be digested but not always. Right now about all you can do is wait and see what happens. You can give your dog a piece of bread that may wrap itself around the bone and allow it to go through the system easier. You will need to keep an eye on your dog's stools to see if the bone passes through your dogs system as well as for signs of fresh blood or mucus.
Fresh blood or mucus indicates inflammation within the large intestine while dark black or tarry looking stools indicate bleeding in the stomach or small intestines. If your dog's stools become black then your dog should see a Vet immediately. If your dog begins to vomit, has a lot of diarrhea, becomes unresponsive to you or squats without having a bowel movement then you should take her to the vet immediately as well. As long as your dog is acting normally just monitor your dog closely to be sure the bone passes through your dog's system.
In addition, bones can splinter and puncture the gastrointestinal tract causing peritonitis. http://www.petplace.com/dogs/peritonitis-in-dogs/page1.aspx
Hope this helps.