'Everyone' is allowed to go to the mall without parents. I asked for names.

Our daughter wants to go to a mall with three friends on Saturday, no adult. Her argument is that everyone else's parents allow it. I asked for names. She gave me two, and one of them turns out to be going with her older cousin. I'm not against it in principle. I want the actual plan: which mall, how they get there and back, who has a phone, what time home. She thinks asking these questions means I've already said no. How did you handle the first outing without an adult?