Try taking the poop outside after she goes. Show her where it is and let her smell it. Maybe it will click for her that she should go outside. Also, if she does go outside.....make a major big deal over it. Lots of treats, lots of happy noises.
Just keep trying, she'll get it one of these days.
__________________ •·.·´¯`·.·•Julie •·.·´¯`·.·• Chloé & Myah |