I know my Twinkie is a little younger, almost 7 months, but she went through the same thing about a month ago. I told her "
No", picked her up and placed her on the potty pad. I said "
potty" when I placed her on the pad. I did that the entire day even when she was being good. I praised her to high heaven! She hasn't made a mistake since. When she does go potty on the pad, I try to praise her right away. She loves my high voice! Who knows why they do what they do! Lol...maybe she was upset that day! hahaha