It is very common for puppies to have worms. Larvae will sit dormant in the mamas nipples. As the mama cleans up after the puppies, and those little worms just keep rolling through the cycle.
It is also normal for the mama dog to have loose stool after the birthing process. But poor Duchess has had the worst case I have ever seen. I called the vet this morning to pick up de-wormer for the puppies and I talked to them about Duchess.
Put her on a bland diet for 2-3 days. White rice and boiled hamburger (with an extra rinsing to get any fat off.) Traditionally you would only feed 1 cup in the morning and a cup at night. But because she is feeding 11 puppies, they said to give her as much as she wants. I made a gallon size baggy almost full. I pretend to give My Jenny some too but she takes a nibble and walks away. I hope that I have made enough for Duchess to get better.