Unfortunately for us mere humans,mistaken. Cats don't think with nice human rationality (they have nice cat rationality
). It could be another mysterious thing that sets her off on these occasions, or any small variation in smells, stress, routine, how she's feeling etc, that just trip the wire that 'it's nice to pee here' - because that wire has already been created.
We are still in training mode too; no stress in the house at present, but we do have a new mattress and pillows (with foreign and interesting smells), so we are being vigilant - no cat in bedroom without active supervision. Sure enough, Kato jumped on the sheet part of the made up bed (pillows already put away in cupboard, most of the bed covered in his rugs) and scratched around and lowered himself a little. I put my hand under him to interrupt any thoughts of peeing (he did a cartwheel thinking I was playing, landing with belly and feet up!), and then he left the room. Just 10secs later when I went out, I could see him peeing in his box. He got tonnes of praise and made blinky eyes at me from the box, so he knew he did the right thing. I'm working on the theory of never letting them refresh that wrong pee idea, and always to refresh the right pee idea, until this becomes the dominant behavioural thought 'wire' in their head. It takes absolute vigilance; which is why the small room confinement works in cases where the inappropriate peeing is happening over a wide space. You know this is a safe room where they can't do the bad peeing - the only lovely pee option in the room is the clean litter box. Then you let them out only under your gaze so instance re-routing can be given. (In our situation, with the bad peeing only happening in one room, it obviously works in reverse but still with the same principle; access to the areas where only good peeing is the pattern, strict supervision in the liable areas.)
We are still in training mode too; no stress in the house at present, but we do have a new mattress and pillows (with foreign and interesting smells), so we are being vigilant - no cat in bedroom without active supervision. Sure enough, Kato jumped on the sheet part of the made up bed (pillows already put away in cupboard, most of the bed covered in his rugs) and scratched around and lowered himself a little. I put my hand under him to interrupt any thoughts of peeing (he did a cartwheel thinking I was playing, landing with belly and feet up!), and then he left the room. Just 10secs later when I went out, I could see him peeing in his box. He got tonnes of praise and made blinky eyes at me from the box, so he knew he did the right thing. I'm working on the theory of never letting them refresh that wrong pee idea, and always to refresh the right pee idea, until this becomes the dominant behavioural thought 'wire' in their head. It takes absolute vigilance; which is why the small room confinement works in cases where the inappropriate peeing is happening over a wide space. You know this is a safe room where they can't do the bad peeing - the only lovely pee option in the room is the clean litter box. Then you let them out only under your gaze so instance re-routing can be given. (In our situation, with the bad peeing only happening in one room, it obviously works in reverse but still with the same principle; access to the areas where only good peeing is the pattern, strict supervision in the liable areas.)