need some help here. have a maine-coon mix that started to pee in certain spots of the house. we have cured her of all her places except one and that's what we need help with. its in the computer room, same spot all the time. no matter what is sitting there, she pee's in the same spot. problem is, its not all the time. this last episode she had gone almost a month with no problems and then yesterday whamo! nothing had changed in the room. we have had the carpets cleaned with special "cat" stuff. i spray at least once a week with natures miracle also.
so, we are going to close the room off to her, problem is, its at the end of the house and we open the window in the room for some real nice cross ventilation. with the door closed thats not going to happen and we really want it to happen

i was thinking of replacing the door with a louvered one but cant find one that has adjustable louvers. was thinking of even using a screen door but am afraid she will get her claws stuck in the mesh while we are gone.
any and all ideas would be greatly appreciated!!!
alan