Night training often takes longer than day. My kids took an extra year or so – they were about six when they ave up night nappies. I didn’t do anything, to be honest – just waited for them to tell me they were ready.

Personally I don’t think it’s such a big problem at that age to wear a night nappy, it’s more common then you think. They’re all different and reach their milestones at different times.
At a certain age when they get older and maybe have a sleepover here and there, they get more aware and more motivated.
My youngest is 6yrs old and lately started to improve during the day, indicating that she needs to go but still wearing a pull up to school. However she has Down syndrome and delay is impacted by muscle tone. I don’t worry yet about night training till she masters day training, but understand this is different.
When you really feel you want to tackle this now you could consider a bedwetting alarm system. Basically, there are three types: alarms called buzzers that are connected to the body, wireless buzzers, and the “bell and pad” type.
https://www.bedwettingtherapy.com/all-about-bedwetting/

Definitely look into night training. My niece wet the bed once and freaked out that she was wet when she woke up and never done it again. Make sure you have a really good quality mattress protector On the bed when you do start night training, switch to something like pull ups or training pants (if you aren’t already) and wake her up before You go to bed, any time you wake during the night (or set an alarm in the middle of the night to take her) and limit liquid intake An hour before bed time.

Just start by stopping their drinking about an hour before they are going to bed and always make sure that she goes to the toilet before she goes to bed. Hopefully she will be dry in the morning and eventually might not have to wear a nappy. My Daughter in law has been doing this with her daughter and it has been working.

Yes you should train her. My children were well toilet trained well before 5 for day and night times.l

My daughter was similar. 4yo and still wearing a night nappy, that was sodden by morning. I just got to the last nappy in the box and said that’s it, no more. I simply stopped. It worked. Occasional accidents but not many at all

Every child is different.May be she need more time.Make sure remind her to go to the toilet before bed time.