Does your ability to type on the keyboard automatically make you an author? The ability to play a music instrument is one thing. Sure, it can be taught to most people and they can learn to play. But what makes a great MUSICIAN isn't just the ability to play, it's that gift to be able to compose/write something good.
Shes six years old and she writes her own music. She's obviously gifted enough to be able to play well. Some idiots here don't realize that not everyone has the skill to be able to memorize scales. Some people do not have the dexterous to be able to play the way she does. Not everyone is talented in a lot of the ways she is. Some people practice their whole life and they are as good as she will be by the age of 8. It's just a fact, some people are born to do certain things. She was born to play and write music. It's obviously in her blood.
It's like saying every guitarist who practices guitar will have the gift of a Jemi Hendrix or Steve Via. It's just simply not true.