It wasn't that she was per sey very mature, as she could have her immature moments just as much as any other young teen. However, she did have her smarts, being able to catch onto things quick, and she was very introspective. So it didn't take her long to think about something and come to a pretty good conclusion.
She shrugged, and smiled cheekily. "Nah, you just caught me in one of my more clear thinking, and mature times." She laughed a bit before taking another bite. "I sort of get that a lot," She shrugged. "I don't see myself as such, except maybe sometimes smarter then I ought to be."