My DD1 is a week older than your DD and she has been TT during the day about 8 weeks. We are still working on nights. I tried about a month before and we had several accidents so after a couple of days gave up. The second time we had almost no accidents for the first week and then in week 2 we had some poo probs with her been scared to go on toilet. This only lasted a week and now she is really good. My biggest advice is to take a potty with you EVEVRYWHERE. So many times whilst driving my DD will decide she needs to go and she isnt very good at holding on. GL and theres no harm in trying if shes not ready you soon find out.