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Hello. My name is***** have been a veterinarian for 11 years. I am very sorry to hear that your kitten is sick and that the others have died. I wish I could give you a magic answer, but to be honest, if you want the kitten to survive, you must get her to a veterinary emergency clinic immediately. The reason this is important is that she likely needs medication and fluids placed directly into her blood stream. You also have to find out what is making her sick. If the mother has mastitis, it can cause the kittens to get sick and then both the kitten and the mother need medication for that. There is not something that you can do at home to fix this problem. I am very sorry.
Problems that can cause this include infections (both viral and bacterial) and congenital problems, such as internal organs that did not grow properly while in the womb.
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