Well I tried started going out with a water bottle in my hand, since I can't move fast I can squirt her if she tries to go back to poo there. I also Put a food and water dish right on her favorite spot. Which was right as you step out the door, I will eventually move it, but i know she won't poo by her food.lol
I'm figuring it out, so far so good. Its working
You do what you can and what works.