When her pull ups are dry in the morning, then she will be ready to wear underwear at night. Most kids do not have big enough bladders to go all night. You could try waking her up before you go to bed to go to the bathroom, or cutting out her milk before bed, but if you don't want to do that, don't stress it. She might not be ready for panties at night until she is 5 or even 6. It's completely normal. But let her be dry in pulls ups for a few nights before you deem her ready to be in panties all night. My son will be 4 in November and is still in pull ups at night. He, too, likes his glass of milk before bed. I think if I cut that glass of milk, tho, he'd stay dry all night.