This morning Maggie kept holding it in. Then when it got too much, she'd burst out with 'Wee, Mummy! Now!!!' and we'd rush her to the toilet, where she'd freeze up, say she was done, then go on holding it.
Only 1 accident, and a little one.
Now she's in her nappy having a nap, and I'm pretty sure she's not holding it anymore :)