She needs wet soft food now. Teeth not stron enough for dry hard food yet.
Wet food is best at this age, because their teeth are too small to eat the dry food.
I would call a vet to make sure that your kitten is not ill and meanwhile you could try "cat milk". This product provides some essential nutrients and hydration. My girl is now 5 and it did the trick for her!
I would call Bass lake veterinary. They will give you great advice
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