
did the vet put her on antibiotics ? sometimes they can upset the tum a bit . I dont like tinned meat I prefer a good all in one dry puppy food then I add a little fresh (frozen then thawed) meat to up the protein .
try a bit of chicken or white fish and boiled potato so she isnt hungry to let her tummy settle , if she ate the placenta then she could also get upset tum from that.
Personally I never leave my puppies I watch them constantly sleep in same room only leave when someone can relieve me (difficult when on own I know) to make sure all are feeding and getting there share, you will always have one or two that hog the milk bar .Any I find are slightly lower in weight I bring mum out onto my bed and let those puppies have a sly feed until I feel they can hold thier own...I find once one starts to feed they all wake up outside the whelp box its a bit easier.
A friend has just lost a pup at 1wk when mum layed on her.