She is good, especially for seven, but if you haven’t heard the Star Spangled Banner sung by the Cactus Cuties, you might be even more impressed.
http://thecactuscuties.com/listen.html
This is an excerpt, the whole anthem will straighten your spine, put hair on your chest, enable one to leap tall buildings, and accelerate faster than a speeding bullet. They were all between 8 and 9 years of age not long ago. There is a little more age spread now.