she wasn't even mad when I came home! Lucked out on my part.
Ya, as a parent of a teenager myself, we have to be careful in how we react to things like that. An over reaction can causefuture incidents to be far worse. We, as parents, want our kids to be willing to talk with us or come to us when they find themselves in a bad situation.
That said... She may not have been mad at you when you got home, but you should know that she will be paying more attention to what you do for quite some time to come.