J.C.
Although I would no longer allow her to have a bottle in the middle of the night, a glass of milk before bed is fine. You will know when she is ready to sleep in undies when she is dry several nights in a row, until than do no push it. Children's bodies learn night dryness at different ages, somewhere between the ages of 2 and 5 is the average (my boys were 24 months and 3 years old), so it varies from child to child. Just worry about day training and when it comes to dry mornings, wait until her body says it is ready.