
The 3 pups will use the milk eventually. It's just a case of you keeping mum comfortable while things settle down and the antibiotics kick in. Poor you, not having your mentor to hand.
I have a toy breed, and they often go a week early, so try not to worry about it. You could try your girl on scrambled egg, poached white fish (I do mine in half milk, half water.) Anything soft that will make her more interested in eating. They don't always want to live on boring old dry feed, even if soaked.
Like someone has mentioned, don't expect her to get out of the whelping box to feed. Hand feed her if necessary. Good Luck! :-)