My daughter is 3.5, and I think she is frightened of weeing without a nappy. She has done this by accident a couple of times and become hysterical, I can see she is freaked out by it. I have also noticed that she gets very upset if she spills drinks on herself. She is determined not to try it. Ive tried bribery, but she isn't interested. I don't know how to move forward…any suggestions ?