My little on is so picky... He will not pee on a used potty pad. I have to change them after every use. He also has to have a seperate potty pad for pooping. I keep 2 potty pads out, side by side. This way he can poop on one and pee on another.
Where does she go poop now? If she has a place were she is pooping. I would place a potty pad there.Then you can move it a inch a day until you have it where you want it to be.