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It sounds like the puppies are coming now. You're most likely seeing a sac hanging out of the vulva. This should result in a puppy being born within 1-2 hours of pushing. If the puppy does not come out, then I would worry it is breached. In that case, we can sometimes re-position it and get it out. Other times we have to go straight to c-section to get that puppy and the rest of the puppies out safely. It just depends on it's position, the fetal heart rate and how hard mom is contracting.
I would give it an hour to see if it progresses. If not, get to a vet for further care.
I hope this helps, let me know if you have any other questions.
Can you take a picture and post it here so I can get an idea of what you're seeing.
If it's coming from the anus, then she may have prolapsed her rectum.
That would look like this:
I hope everything goes well.