If this is a sudden change in behavior and nothing in her environment has changed (litter brand, box location, new people in the house, someone moved out, new source of stress...house construction for example, etc.) then she likely has a urinary tract infection and needs a vet visit.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...