When both of my kids was 4 yrs old , i toilet trained. Make sure they pee in the toilet before bed. There were many times they peed on the bed during sleep, eventually they learnt about going to the toilet after that. So I have to constantly remind them that if there is urge, must wake up go toilet peepee. So , yeah, expect many peeing on bed to happen before success happens.
It could be that she’s not ready to be toilet trained at night yet. Make sure she goes to the toilet before bed and no liquids an hour before bed. Continue to give her diapers until such time you notice that her diapers are dry in the morning. That’s when you can start!
Hi Mummy, this article might help: https://sg.theasianparent.com/8-night-time-potty-training-tips
Lena Tan