Sara, I would suggest that when you bring Macy in or even before if you have a spot set up for her, bring a litter box to her, place her in it and take her paw and "dig" for her....I think she will get the idea that that is the place to do her business.
thanks for the idea... i will try that. I got her a little box on the porch with some towels in it... I have never actually seen her in it but she goes in it every once in a while and scratches the towels out... I guess I will put the litter box next to the little box house.