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It sounds like she might be hypoglycemic. This means that her blood sugar might have dropped to a dangerously low level. I suggest that you put some karo syrup or sugar on the tongue. This should perk her up. Then stay with her and make sure she nurses every 2 hours during the night. If this does not help, you need to see your vet in the morning.
I answered your question within 30 minutes of you posting it so am not sure how much quicker we could have been.
I am very sorry for your loss. I know that last night must have been a long night for you.
To answer your question, hypoglycemic animals will seize, come out of it and then can seize again. This can look painful and they might make noise but no one knows for sure.
Again, please accept my condolences for your loss. I am very sorry for the pain that you suffered during the night when you were not sure what to do.
My thoughts are with you.
She might be. Any time that kittens are not allowed to nurse at will, they can become hypoglycemic.
I also worry that you are dealing with a respiratory illness or other infection because of the squinting eyes.
I think that you may need to see the vet to rule out a bigger problem before you lose all the kittens.
If mom will tolerate being confined, it's fine. If she is upset by it, you will need to rethink it. Keep a close eye on the sick kitten. Mom will often push a sick kitten to the side because she knows that something is wrong.
You need to see the vet with all the cats tomorrow.
Also, have you seen any fleas? Newborn kittens can die from flea infestations.
I am glad that my answers were helpful to you. If they were, please don't forget to accept one of my answers so that your deposit can be transferred to my account.
I certainly would appreciate it.Tammy