hon, call your vet. and ask them what's going on, you can atleast find out what it could be. The worms could seriously fuck up her insides but I'm not an expert on this at all. Try and comfort your girlfriend and feed the puppy with a bottle of milk or try and get her to eat wet dog food. Keeping the puppy fed (and alive) is the important thing right now. Stay around the puppy as often as you can and pet her and keep her comfortable. Call the vet though, that's the most important thing.