Hi Sherri,
Based on what you are describing, it doesn't sound like she has interstitial cystitis, and that this is a behavior issue. Although one more question...does she have mobility problems or arthritis? Next steps would be to do things like a litter box trial... where you get her into foster and keep her in a room where she is offered several different types of litter (e.g, clumping, nonclumping, other type). After that is done, i'd try a covered vs an uncovered box to see if she has a preference for one vs the other. Once you know her preferences, i'd confine her to one room with that litter and box combo, and see how she does. If after a week she is still using the box, i'd increase her access to the home. If she is super fearful, i'd be sure to have multiple boxes around the home to make sure she doesn't have to travel a long distance to get to a box. I'd also consider things like a lavender oil diffuser or feliway. There is a lot you can do to help this kitty, so don't give up, and stay in touch
Sheila
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