Carnation condensed milk, white ice cream.
Please do not let them give oxytocin.
I lost a whole litter when my vet did this. The bitch was definitely in labor, but was not passing any puppies. So we did an x-ray to ensure there was no puppy blocking the birth canal, and then they gave oxytocin. and another oxytocin, then she gave me a third shot once I got her home, which I gave her. Nothing.
I took her back and she did a C-section. She told me that the pups were not ready, they did not make it, they also looked all bruised. Oxytocin can cause that bruising by making everything contract.
When I took her to the reproductive vet, and relayed what happened, he shook his head in frustration. He said, that you should not do a C-section without checking progesterone. My vet would have to send this out and get the results tomorrow -- not good enough, so for C-sections I go to the repro vet. He then said that there are safer drugs to use to get things going.
Please have your friend take the bitch to a repro-vet. With all the spay-neuter, and with reproductive specialists around, regular vets do not see enough labor and complications with labor. You are seriously better off with a seasoned breeder.
My vet wanted to give antibiotics to puppies that weren't thriving, eventhough they did not have a fever according to what they thought a puppy's temp should be. And when they put them in an incubator, they got their temperature up to 100 degrees. Their temp should have been no more than 97-98 on the outside. If I did not run those puppies up to the repro vet, I would have lost them.
I wouldn't wait until tomorrow either, if she passed a dead puppy today. I would go today to the reproductive vet, have the progesterone tested, get an ultra sound, and go from there. If the placentas are separating now, you will lose the puppies by tomorrow.