I agree with BCkrazy. Once that litter of puppies is weaned, don't expect her to stay calm for very long. You are lucky that she is being calm because she could be a hormonal terror. Unlike cats and people, when a dog has a bladder infection they pee more instead of just squatting and nothing coming out and they pee in places they usually never would, like your bed. If she has a urinary infection she probably won't be able to nurse the puppies anymore if she has to be put on antibiotics so be prepared to start bottle feeding. Welcome to the joys of raising a litter.