
Do not let her leave the whelping box at all and put the pups on her to feed as soon as they are born.
Even if this means holding her while you tell her what a clever girl she is and praise the puppies. The suckling will help with the release of hormones for further pups to be born and to kick in the maternal instinct.
Have you allowed her to eat the placentas?
Two years ago my bitch was frightened to death of her first puppy and while giving birth would have done the wall of death around the bedroom had I not held onto her. After the second was born it suddenly started to click with her.
It sounds stupid to praise the pups, but in this way you are reasuring her that they are not poo. Do not leave her unatteneded with them for a second though until she has accepted them.