Foul smelling cat poo...?

The food is certainly the problem. She may be too young to digest certain ingredients in it or has an allergy to a certain ingredient that is making the foul smelling poo. I would switch her back to the wet . We had a cat on the RX intestinal formula it was easy to digest for him and mixed that in gradually with a commercial wet food and no problems. On rare occasions he would have a flare up of tummy/poo problems and we would give him the RX diet again for a short while.