I have a 3.9yo little girl that will not go on the toilet....she has just started to wear knickers and she either wets herself and doesn't tell me she needs a wee or holds it and I tried to be determined but she has a bladder of steel and can hold it all day and I'm worried she is going to do herself serious harm by holding it for so long as she is very stubborn..!!!! I have tried everything stickers chart....toys..chocolate!!! Bribery...even the nursery are involved and nothing....she just holds it.....I am trying not to get stressed but I am at a total loss at what to do and where to go from here...at Wits end!!! Ps..we have also bought every potty gadget know to man to make her feel better :(