Is this both pee and poop? If it's just pee, you may be dealing with a urinary tract infection or crystals. Cats will typically go outside the box when this happens. First I would try bringing the box inside (and put it in the bathroom she's been using) to see if she's developed an aversion to the porch for some reason, but if she is still not using it, then I'd recommend a vet visit.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
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