Yes she (Tina s) has practised hard, 8 hours a day from the age of 6, she is 18 now.
However she has a natural gift for the guitar.
I don"t think that she has no feeling, that cover of Steve Vai"s for The Love Of God is full of emotion.
If you are familiar with the original then you will know that her cover of it is different & she has indeed made the song her own.
She is not just technically proficient, & if you listen to her covers of Gary Moore, Pink Floyd"s Dave Gilmour etc you will see that she is not just a "shredder" but has reel feel as well.
Agreed all her you tube videos are covers but that is because she has a professional guitar tutor who has been getting her to cover more & more complex songs as she has got older, the above mentioned plus things from the likes of Yngwie Malmsteen, Jason Becker, Dragon Force etc.
She has now started doing guitar covers of classical songs like Mozart, Beethoven etc.
https://www.youtube.com/watch?v=o6rBK0BqL2w
She has not been allowed to pursue a career in music yet as her parents have wanted her to concentrate on her education for now.