Milking a dog to feed the puppies is not really a do-able thing. As Ginger has already stated, feeding them cows milk is not an option either. You need to have your vet show you how to tube feed the puppies. It's not difficult and it is really a lot safer than attempting to feed them with a bottle. If they are laying on their backs when nursing from a bottle it's very easy for them to aspirate milk into their lungs, which can cause a deadly situation.
Tube feeding requires a syringe (10cc is probably an adequate size for newborns, they'll only need a couple of cc every three hours when they're that little) a feeding tube, and formula. When you tube feed, you take the feeding tube and hold it along the outside of the puppy so that the tip of the tube touches the puppy's side right in the flank area. You then mark the tube where it touches the puppy's muzzle. Normally you will have about a 5 or 6" length of tube marked off for newborn puppies, but giant breeds, of course, will be larger. When you insert the tube down the puppy's throat, the puppy's natural sucking action will pull the tube in, helping it to feed its way down the throat into the stomach. As long as you have the tube in as far as the mark you made on it, it can be nowhere else but the stomach. If it goes in 3 or so inches and stop, pull it out and reinsert it because to meet resistance after that short a distance can only mean that the tube is in the lung instead of the stomach. Once you have the tube inserted to the mark at the muzzle, slowly push the plunger until all the formula is in the puppy, then remove the tube. Go on to the next puppy. The formula container will have instructions on it as to how much to feed based on the weight of the puppy. Each puppy should be weighed before each feeding to make sure they are gaining steadily.
What breed of dog do you have? How old is she? Is this her first litter?
Ghilly
Puppies can get dangerously dehydrated very quickly. If she still has refused to feed them, it's now become an emergency situation. You may have to take over hand feeding the puppies to ensure their survival. It's possible te mother may go back to them, but you can't take the risk.
You must not try to feed them cow's milk. That could kill them. They will need special formula. I recommend you get advice and help from your vet a.s.a.p.
There could be a physical reason why the mother will not feed them. Check her nipples and breasts. She may have blocked milk ducts....mastitis....sore and cracked nipples.....etc. She may need attention too. See if there is any redness, heat, or undue swelling, or if touching them makes her show signs of pain or discomfort.
Good reason to see a Vet.