The context of the following conversation is Aubrey turned Sydney back from the door, because Aubrey knew about all the dangers on the other side.:
Aubrey says I didn't let Sydney enter the door..
The friend responds Good for you! She has no idea what's on the other side..
Aubrey responds No, but I do. That's why I wouldn't let her pass through. She's not ready for it..
The friend responds I'm glad you're looking out for her..
Aubrey responds Somebody has to. She's getting reckless..