I was gonna say why fix it if it ain't broke? If kitty is not wanting to go outside, let it be. I have 4 cats and they are all content to be indoors only except for one. Every time I go out to the foyer, she follows me there and when I get in, she lingers staring longingly at the door. In the spring and summer, we can go outside with her leash and harness, but in the winter it's not happening, but it is always a point of contention with her. I am always afraid what will happen, if we ever let our guard down and she gets out.