Dd2 is 3 in January and nearly too large for the largest pull ups.
In the summer we started potty training and she really shocked me as she was dry during the day and the occasional night for about 5 weeks(including on holiday)although she was still holding onto her poo and going to hide to do one in her pull ups.She refused to wear proper pants btw.
Then she decided that she was going to stop and just go back to weeing herself.
Sometimes she can be coaxed or bribed into doing a wee on the potty or toilet but most of the time she refuses.She is capable of knowing when she needs to go and sometimes she has her wee for 15 hours and then just wets herself.
I am struggling for ideas now.