Any change in your cat's food intake or a change in the kitty litter may cause a change in how quickly mold grows on the feces.
If your cat's food is not stored in an airtight container it could contain extra moisture which could cause mold to grow on the food. She would then be ingesting mold, and thus defecating it later on. Not all molds are highly dangerous, however, but it can impact your cats gastrointestinal health adversely over time. If there is a chance that her food could be moldy, please change her food and discard the old food.
You did not mention where you are located but if you are located in a climate undergoing a rainy season right now, the additional moisture and humidity in the air can cause faster mold growth on anything.
If your cat experiences any gastrointestinal problems please take her to the vet, however, I think that this is an environmental problem and not a health problem.
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