Have Cat Questions? Ask a Cat Vet Online.
I am sorry to hear you are worried about your Sphinx. My name is Rebecca. I am a veterinarian and will do my best to help.
A diet change can cause diarrhea. Usually after being on the new diet for a few days it will clear up, unless the new food really does not agree with her. If you have her old food, you could mix the new with the old for a few days to make the transition to the new food easier on her.
Probiotics (beneficial bacteria supplements) made for cats such as Proviable or Fortiflora should be safe and may help.
If she is eating, not vomiting, and is drinking, this is probably not too serious. Let me know what other questions you have.
You are welcome! Let me know how she is doing.
Kindly consider rating my answer so the website knows I assisted you. I hope she is better soon. Rebecca