The only thing that I would suggest is catch her urine and poo put it where you want her to do potty and maybe she will follow. But that is what Vicky also suggested. Also I would say does she have a favourite toy? I know it sounds silly but that sometimes does the job too. Put it there for her to get her comfortable, and leave it there. I`ll be thinking about you two, hope you find a way, because my suggestions won`t be of much help I am afraid.