Have you tried sticker charts and other such bribery? (Cars2 figures in our house)

Is there any need for her to be TT at the moment (i.e. kinder or something)?

I only ask because I cannot help you at all. I struggled for such a long time with DS1. He got the idea for months then regressed - completely. And for nearly a year. We still have issues with him not going when he needs to and then constantly doing little wees in his undies. He's just turned four.

DS2 decided that he would do it all himself. He just started waking up in the morning dry at 20 months, and so i took his nappy off and we never looked back. Ok, so he's not perfect, but we have not endured the tears, trauma, guilt, anger etc that we had with DS1.

DS2 is fully dry day and night. DS1 is still wet at night and has many little accidents.

So, i guess i can say that i am really all for giving it a go, having it all there ready and waiting, but if it doesn't work, don't push it. Just try again later. And again, and again. Until one day it'll all work and it will have been a lot less frustrating.