
Have you been cutting their nails, if not sharp nails will make feeding very uncomfortable for the bitch.
This is peak lactation, so is she getting enough high protein food and just as importantly lots of liquids. At this stage with my most recent litter my girl was on 6 times her normal food rations.
If this is a medium size breed and up I would start offering supplementary semi solid food (I normally start mine with a taste at 18 days and by 21 days they are on 4 tiny meals). Once they get the hang of eating I feed to appetite and by 4 weeks they are really putting it away.
Certainly she will be conflicted between her attachment to you and mothering the pups so you need to do everything to encourage her to stay with the pups.
Are th pups away from where she would normally be? If so it is time to bring the family more into the thick of things. At this age I normally bring the puppy open into the kitchen where the other dogs are. This usually makes Mum keener to stay with the pups, as well as exposing them to more goings on.