
what they did as successful solutions in the show was to place a toiletbox on the kitchen table (lmao, how shocking) where she made the biggest messes, made a new cat place in the backyard where she can play freely, expanding her safe territory, and cleaned up all dirt in front of the windows where other cats visited to piss, placed rocks all over so visiters wouldnt find it comfortable to piss.
this cat guy said that cats spray and mark everywhere when they are frightened/threatened and feel the need of marking everywhere as their territory to drive their predators away. this family set a webcam to record this cat peeing, and it showed how she pee on this couch, marked around, and froze for a second, looking at the direction of a big window (most likely another cat visited).