My daughter having been fully potty trained has suddenly decided to withold her wee and often the other for 24 hours at a time. Until she cant stop it coming out. She had a mild accident and this was enough to scare her and produce this problem. She is 3.5 years old. She knows she needs to go and having nagged at her to keep trying I have now backed off and said she knows what she needs to do and just to let me know when she wants to go. Will she get sick? This has been going on for a week. I don't think her aim is to go back into nappies it's a fear she has developed. Would appreciate some advice. Thanks