Have been potty training dd who is 3 in sept for the poast 2 weeks. She is great at weeing in potty or toilet but I cannot get her to go on them for a poo. It has been 2 weeks now I thought she would get the hang of it. So many knickers to wash. Any advice? I have tried sitting her on potty when I think she needs it but she gets upset and it makes it all worse.