My eldest daughter,now 7, was dry during the day by 2 1/4, she was then dry at night by 2 1/2. However my second daughter, now 5, was not so staightforward. She was dry during the day from 2 1/4. However she only became dry at night about 4 months ago. She was waking up with a soaking nappy every morning until then.
I don't think there is anything you can do, they are just ready when they are ready. It is tempting to take them out of nappies when you feel they should be, but you're just making lots of extra work for yourself. Both physically, changing beds in the middle of the night and mentally, trying to persuade a child to do something they are not ready for.
I found talking to other Mums reassuring. All of those whose children weren't dry until they were older, said not to rush the child and now mine is dry I know I did the right thing. Even though when she was younger I wanted her to be dry at night as early as her sister. This is the first time I have contributed a message, I felt moved to contribute because I remember how frustrated I felt in the same situation.
Going back to the original contributer, I think 5 days is very good and she will probably be OK. Both my daughters, once they got the hang of it, they were fine. I did put my second daughter on the loo when I went to bed at 11, for a couple of weeks. She had would have been asleep since 7.30.
Hope all this is reassuring.