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I am sorry to hear you are worried about Athena. My name is Rebecca. I am a veterinarian and will do my best to help.
When she pooped, was it normal stool or diarrhea?
I would throw out the week old food. Are you feeding canned and dry kitten food as well as the KMR?
Rubbing her anus on the ground is sometimes seen with diarrhea so knowing what her stool looks like, formed or not, will be helpful. Having a stool sample tested for parasites might be a good idea; most parasites are too small to see without a microscope; some are as small as a single cell but can still make a kitten sick.
I have not heard back from you; I hope you saw my response. How is Athena doing? Can I answer any more of your questions?