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I would get a carrier and put the mom and three kittens into the carrier and go to your vet. Hopefully, they are open. Your vet needs to check the mom. He needs to make sure there is not a retained kitten, or something that you are not seeing.
The panting can be anxiety....but I really recommend getting her checked before the holiday weekend.
That is true...have you noticed anything wrong with it? In any case as long as the kittens are warm and not crying...they are fine. If the kittens are crying...or cold then toolong. I can't put it in a time...but kittens are fed about every 2 hours.