Ditto what Anke says, don't know why you decrease food before kidding, just when the kids should be taking the most from the food she gets. We do the same, and as soon as they kid, they get no concentrates. Just vegetables, alfalfa, and sugar beet (not all at the same time). Then after at least a full day, they get a tiny amount of mix added to the veggies/ alfalfa. We've got two who kidded a week ago, and they still aren't up full rations, and are getting extra bulk foods- sugar beet, alfalfa, bran mash, branches if available.
But to the original point- I would definitely be milking her. You may even find you with only kid that you always need to take some milk off her.
Beth