Please take her to the vet! It's probably not this, but I recently lost a 2 year old male cat who had cystitis which developed into hepatitis. He was a lovely little cat and although I got him to the vet quickly and she did everything she could, he still died. Your kitten is still very young and may not have the immunity to infections, so I urge you to get her seen by a vet as soon as you can. I wish you the best of luck and please let us know how she is...? K xx