Hi Karen,
Well, litter box issues aren't easy...have you moved recently? Any household changes? Stress? Did anything happen right about when she stopped using the box?
If none of these apply and she has been checked out by a vet, try putting her in a large dog crate with her litter box, supplies and a bed for a while and see if she will use the litter box then. Sometimes when they are kept very close to it, they get the "hint". Use an enzymatic cleaner on your rug to try to eliminate the odor of her previous accidents.
Sometimes cats are MORE inclined to use a litter box that has their own scent in it. If the litter is too new, maybe she isn't getting "the hint" anymore.
What kinds of litter have you tried?
Sorry for all the questions, but maybe something here will click....
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