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If you have other cats or something interfering with her litter box, that could be the problem. If her box is dirty, or if it's inaccessible sometimes--closed door, or running washing machine that troubles her, or even something like a pile of laundry blocking her path or too close to the box for her happiness, that could cause her to go somewhere else. Or she could be upset with something else related to her daily routine. Cats sometimes go off their box because they are upset about the box or about something else in their life, but also they sometimes feel the need to claim a different area of the house. One cat I had used to follow a newer cat around and pee wherever that cat liked to lay down, for instance.
But if you don't have another cat, and there's nothing interfering with her box, and it's clean and you aren't switching litter brands, and her normal routine isn't messed up, I'd bet on her having a bladder infection or UTI or even a kidney problem.
Almost every time a cat of mine has peed outside the box it's been a health issue, even at times when I first thought it was something else. That's the most likely cause. Female cats are harder to spot UTIs in than males. A male gets complete blockage, and it's very painful, so you know right away. Female cats don't get blocked the same way, so they still go, but they have less control, so they go where they happen to be, or just try to go wherever they are when the pain builds up.
Take her to a vet. they'll probably give her antibiotics and give you a better food to feed her. Also, give her filtered water if you don't already. Not mineral or spring water. If you want to skip the vet at first, try getting a high quality food from a pet store that doesn't carry Purina style brands--they don't have a lot of the contaminants that cause UTIs and blockage. That might fix it by itself.
It could also be something health-related but not a UTI. If the cat is just sick in general, she could go off her box. Get her to a vet, have her tested for the usual problems, and see what they find.
One last thought--We rescued a litter and an outdoor cat once, and kept her inside with her kittens until they were big enough to give them homes. The mother never would use a box, even though she had a room and her own box. She would pee on the furniture and poop everywhere. The worst was the time she got on the kitchen counter and left her message. That was pure rebellion--she was showing us what she thought. It doesn't sound like that's your problem, since it's a new problem with a cat you've had a while, but thought I'd mention it.
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