
Hi you have been busy.
Have you managed to speak to who had her for her first litter, they may have had the same attitude towards the pups and advise you re what was done then. No one knows how a bitch will react towards their pups,hormones are funny things and can take a few days to settle down. Your vet has ruled out eclampsia[low calcium levels] but I would still give the dam some cottage cheese,yoghurt and goats milk to drink my girls love that treat.
When the pups started with the loose stools had Mum been fed anything different in the previous 24 hrs, this can also upset the pups digestion. If you are present all the time then I wouldn't limit Mum's access to the pups, not only does she need to feed and clean them she has to teach good manners as they get older so the pups learn before they go to their new home, what we find on here is majority complaining about their puppy biting them is due to them being seperated from the dam too early and not allowed to mix with other dogs in the household who also help with the rearing. The pup that is the smallest now may well catch up and pass her litter mates in size,provided she is gaining weight daily and doesn't look like a bag of bones then I wouldn't worry,she needs to be able to feed frequently as she may not have the energy to suck for as long as the bigger pups, as the pups become more mobile they will burn off more calories so will need to feed as they want to or will start losing weight.
Have you wormed them yet, I do 2,5,8 weeks and Mum too,then final worming 12 weeks before they go to their new homes.
The pups normally start passing urine and faeces on their own when they start weaning at 3 weeks as there is more solid to come out than the milk you are used to seeing, some times the dam will continue to clean them, I have a male here who does a grand job from 4 weeks onwards supervised initially by Mum and myself[video on my website], he likes to show his feminine side.
Raising pups isn't the dawdle some folk think it is going to be. I hope it is all plain sailing from here for you.