If you are considering to try another litter I can recommend one. It is very expensive, but my cats like using the Worlds Best Cat Litter, you can buy it online or from a pet shop. The granules are very small and it is easily disposed of down the toilet. It clumps together well, does not smell and my cats bury their wee and poo quite happily in the litter, leaving me to clear up their mess of course!
I very much hope that you have got on top of this now Tezzabell, as it would be awful to have to get rid of the kitten, especially as she is probably settling into her new home. Best of luck, hope everything works out.
Sue