Now, and bear with as I am slow in the mornings (and not much faster the rest of the day), the doorbell camera lets you know who it is, and you go to open IF you recognize the person, ESPECIALLY late at night.
My point, and I do have one if you give me a moment to get to it, is that if NG went to the door, she KNEW who it was. If she didn't and she opened, she did it cautiously (one hopes), and the metal gate would be (again, one hopes) locked. It will, as is the case with storm doors, open out towards the porch, and she would have been behind the door that opens IN towards the house.