Is there any news on your dog? What did the vet say?
It's not unusual for them to rest for a couple of hours in between the emptying of the two "horns" of the uterus if you're talking about a large litter of puppies. However to go this many hours following the birth of one stillborn puppy doesn't bode well for the rest of the litter OR for the mother if veterinary attention is not sought IMMEDIATELY. Please let us know what happened!
Ghilly
Yes!! You need to get her to a vet immediately. If you don't already know of an ER vet in your vicinity, call your local vet clinic. They should have an outgoing message directing you what to do in an emergency. This is an emergency, so get calling!