
Yep I'd continue feeding what the bitch needs and the milk will go if she limits them.
If she is going in and seems to want to feed them, but is overwhelmed, I found with a bitch in the past that letting a couple of pups out at a time to her that she was much happier as they didn't all descend on her at once.
She could still get away fi she wanted, but I let one pup at a time out of puppy pen, until all 9 were out and she was happy with that, but only fed for a brief time, just a coupe of times a day at this age.
Never had mastitis when bitch decided to stop feeding even when quite abruptly, only had it once with a 10 day old litter where infection had been tracked into hind glands when squatting low to ground when peeing in winter, so nothing to do with feeding pattern
As jean says I find I need to feed my girls extra even after pups weaned as the post partum moult takes them down in condition otherwise, and it helps coats to come back sooner..