What you can try to do is to bring her to the toilet just before bedtime, and also bring her for 1 “dream potty” session in the middle of the night to empty the bladder, and then to the toilet immediately on waking up. You can observe how much she pees in the middle of the night to see how much she’s holding in. Also bring forward her prebedtime milk feed or reduce the amount of milk so she doesn’t have so much in the bladder overnight.
Cherlyn