Abnormally bad smelling cat?

Of course it's not normal!!! A kitten shouldn't smell that bad, nor should an adult cat unless they have a blockage or a cancer somewhere on or within their body. I would advise you to take your kitten to a vet asap, it maybe she's been bitten by a tetsy fly and it has laid eggs within the wound,vthe maggots of this fly actually eat their way through their host ----- hence the smell??? I hope for her sake and yours that it isn't this fly, if it is -------- you have to do the kindest thing and put her to sleep. Sending you all best wishes and a million hopes that she'll come out ok, God Bless you both xxx