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I am sorry to hear you are worried about your kitten. My name is Rebecca. I am a veterinarian and will do my best to help.
I would not use activated charcoal. It is not that helpful for diarrhea, and can cause problems like her sodium levels dropping too low. You can try probiotics, beneficial bacteria supplements. I like ones made just for cats, like Fortiflora or Proviable. You can use Culturelle from a drug store for people.
If the diarrhea persists, I would have a stool specimen examined microscopically for parasites. Not all parasites are worms and most are too small to see with the naked eye.
Let me know if this is helpful and what else I can answer.
How is your Blitz today? Can I answer anything else?