Was this a gush of fluid possibly clear or greenish in color?
Or is it a mucousy discharge from the vulva?
Is she having contractions that you can see?
Did she stop eating?
Any vomiting yesterday or today?
Can you describe her behavior?
You should see a puppy pretty close behind the water breaking. It has been much longer than it should have. The water breaking is the sac around a puppy breaking. If you don't see a puppy pretty quick, it means the puppy is stuck and unable to be delivered. Without the sac, the puppy can't survive for long. After this long, I would be surprised if this pup was still alive. If you have one pup stuck, the rest can not be delivered and their lives are also at risk.
Sometimes puppies are too large to be born and get stuck. Dogs can also experience uterine intertia and you need a visit to determine if a shot to restart labor is needed.
Most dogs in labor do not sleep though. If pregnancy was confirmed, I'd go ahead and have her checked by your vet. here is a site that goes over difficult labors in dogs.
Hope this helps.