That sounds like a punishment to me. Your dd does something you don't like, you isolate her, then talk to her about why she was punished and what to do next time. Consequences and punishment are the same thing, consequence is just a prettier word. Punishments/consequences are effective often very at stopping behaviors, that doesn't mean that it is something I agree with or would personally use in my home and it definitely doesn't mean that it is the only way to teach a child how to be thoughtful and considerate. People warn their kids and try to redirect them before they smack them to, that doesn't mean that there will be a bunch of people on the GD board calling spanking a gentle consequence rather than a harsh punishment . The use of warning and redirection doesn't change punishment into something loving and gentle.
It's just plain discipline to me.
They serve the purpose of getting a child to cool down, back off and can help the child learn. Teaching a child that the way they are acting is inappropriate and hurtful and that right now, it's time to take a break from the situation and re-evaluate in a bit. In other words, I use them to teach. Not to punish.