This is going to be really common (videos of "pop stars" at an early age) really soon. Get ready (everyone, not just Top 40 artists) to have your life on searchable, archived video at a very young age.
Saw her Letterman performance the other day, just based on that her stage prescence is maybe 1% better than Lana Del Rey's. I'd say she definitely has more potential though to be fair, she is really young. I sure can't imagine doing Letterman at 16 or 17, whatever she is.