I am very sorry, I know how you feel after trying so hard. It is obvious that all the kitten were sick at birth and so was their mom. Take a look now to make sure that the milk she wasn't able to give them is not being retained and causing her a problem. Couldn't you take her to the vet to make sure her treatment is doing its job? More so because she is affected by the same condition her kittens were. Once she has recovered she should be operated to avoid new pregnancies. Is she your own cat or a feral you have rescued?