L.E.
having five children and 14 grandchildren i can only offer a slight suggestion, since she will go back to bed if left alone. If you put a dry washrag folded maybe once or whatever will let you shut the door on it up near the top of the door :it is too hard to open by the child but is not a lock or anything that would make it not safe to open by an adult. when she cannot open the door she will go back to bed, right?