DD is almost 6. She's been dry during the day for nearly 3 years now. But night-times have been a disaster. We've tried pants, we've tried pullups, we've tried bribery and reward charts. She's had maybe 10 dry nights in nearly 3 years. She gets upset and asks why her body won't do it right. We gave up and put her back in pullups at night because we were changing her bed twice a night and we were all wrecked.
We've noticed, though, that when she puts her pullup on in the evening, sometimes she'll wee in it downstairs, before she even gets near her bed, never mind goes to sleep. She knows damn well she's not supposed to do that, we've told her so every time it happens - she's just being lazy.
Now I don't know if the nighttime 'accidents' are just out of laziness too.
Have a read at the Eric's website, some children just aren't dry till later. It is not a matter of training, some children's bodies don't release the hormone the suppresses urine production till they are older. It is a very fustrating stage.
We have almost got my 8 .5 year old dry at night now despite the other 3 being dry at night between 3-4 years of age.
I wouldn't be putting the pull-up on till you are tucking her into bed. Do the double wee - one at bathtime/changing for bed if no bath then another after teeth, stories etc etc, ie literally just before going to sleep. This second wee has taken over a year for my DD to master.
From 7 you can refer to the GP for the Enuresis clinic. I have found ours very helpful but the referral process does take time. They are also very good for reassuring children that they are in a job because many more children than just them have the problem,