Wherever the spot is that she chooses to defecate, you'll have to use a cleaner with enzymes, because she'll continue to go to that spot. Be generous with the cleaner. A cat's sense of smell is so much better than ours.
If she can't handle chunks of food, there are lots of pureed cat foods available. Good luck.
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A dog, I have always said, is prose; a cat is a poem. ~Jean Burden