Everything sounds normal except the fact she hasn't uttered a sound. Almost like she doesn't know she can bark or make any sound. Have you checked the inside of her mouth for deformities? Getting her checked out wouldn't be a bad idea just to make sure she is healthy. Most pups are born with at least roundworms, so it would be a good idea to bring a sample in if you take her to your vet. You giving her a forever home?