Aww, what a pretty name you chose for her. Definitely it could be that she was too hungry to produce much milk, if the kittens are suckling that is a good sign, and she should be producing more. Keep a close watch on the kittens, if they seem at all dehydrated, give them the KMR. If they show signs of getting weaker, do it, too - they are at a very delicate stage right now.

Does Celeste clean the kittens at all? If she was starving it may be a bit before she actually poops, poor thing!