What should I do now with my dog and her only puppy?

My dog had given birth to three puppies, however, the sad thing was two of the three puppies were stillborn. She had refused to push the first puppy out until it suffocated, the first puppy was born feet first. The second puppy was near death and we tried to do CPR and take her to the vet but it died along the way. It was noon and we were near depression. That is, at 6 PM, she had given birth to one more puppy and she began to nurture it. It seems to be doing fine right now because my dog is nurturing it and feeding it as needed. I'm afraid my ***** would be depressed over the first two pups and ignore the third pup. And as the question was originally made for, what should I be worried about now? (they're both healthy and the puppy is 1 day old)