DS is nearly 11 and is only just dry at night.
My DD is 22 and was not reliably dry until 10 years old.
DSis wet until she was 12.
There is a hereditary element to this hormone kicking in late.
I was very relaxed about it, knowing how much all the attempts to make my sister dry affected us all. She had a buzzer alarm, which woke us both, I declined to use one for my DS. It wasn't effective anyway for DSis!
All I did was make sure DS drank as much as possible during the day, hard as he is a reluctant drinker, then limited to sips of water after tea time. You must make sure she is drinking enough during the day, as concentrated urine is more likely to irritate the bladder and make her wet herself.
We were also told no 'red drinks, so no blackcurrant and no fizzy drinks, which he didn't have anyway.
We let DS continue to wear 'night pants', not nappies, nappies are for babies! He took it off in the morning, washed himself and put his night pant in the bin. All on his own, for his own self esteem.
He even went on school residential trips, where the teachers are well versed in dealing with this. He actually wet through his sleeping bag one night, but his room mates were oblivious and his sleeping bag was washed and returned to his bed discretely.
He has been to sleep overs at friends too. I just told the parent and he ensured DS was allowed privacy to deal with it and knew where to dispose of night pant.
It has never been an issue. DS has never been upset by it, because I chose not to get worked up about it.
Please relax over it, certainly now, but maybe seek advice/help from the school nurse when she turns 7, as that is the earliest age they will be concerned.