Ben was dry at night from around 4.5, I did nothing to 'make' him do it, just one day they were dry in the mornings. I did notice though once he stopped wearing them, that some nights he would be restless/not wanting to sleep for an hour or so, then he said he had to pee/poop, once that was done he went to sleep.
I used to get so frustrated that he was messing about until I realised perhaps subconsciously he knew he'd need to go!! Do you take her to the toilet before bed each night? Even if she says she doesn't have to go, ask her to try?
Like a PP said he doesn't wake up to pee (every few months he wets the bed, but it's getting better) and he doesn't run off to do so in the morning.