Changing cat from indoor/outdoor to indoor only

My cat has made that adjustment several times, depending on where we're at. During each of the 'indoor' periods, I keep a spray bottle just outside the door of the RV, ready to spray water just as soon as I start opening the door if she's poised to run out as I'm coming in. After a few weeks, I don't have to worry about her anymore, or at least not every time I open the door.