Yes, she is chewing gum (like a normal teenager) but is totally focused. What she is doing is not blasé. A classically trained guitarist does not waist energy on unnecessary body movements. Everything goes into playing the guitar; exhibitionism is not required; only the music is important.
Now that you've seen this one, you definitely want to go check out Herman Li's reaction to it. There's a lot of cussing and at one point you can see his mouth drop. Look forward to the next one. For the Love of God is my favorite because it requires feel and emotion, as does The Loner and Altitudes. So far I've really enjoyed the songs you've picked, so whatever you want to do next is fine by me.
Yeah, and you forgot Herman Lee did say that if he didn’t want to ever play that song anymore, he knew who to call it one point he said oh shit I didn’t realize she played that solo so well and then another one later on he’s like damn I guess this is the best covered through the fire and flames. He says it is.
The sad thing about Tina is that she disappeared and has done anything in several years, so many band could have used her and any of those bands would have done amazingly great. Here is another Prodogy you may have or have not heard of and that is Indonesia's own princess Ayu Gusfanz, perhapas at the same caliber or maybe much better than Tina since Ayu has been composing and writing her own songs since she was 11 years old, she is 16 years old as of now but in June she will be 17 and is a master of her craft. I will start you with her cover of Joe Satriani's "On Wings of Peregrine" and she was 14 years old on this MV ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-N6xDZmFYdlY.html
You know Tina is perfectionist doing her work on a top level this is why she is highly praised by high class musicians (You can read the comments on her videos). But she is also a private person she prefer it that way we need to respect it. Even she disconnected on YT it doesn't mean she quit playing guitar or we can't say she didn't made her own stuff. Also composing and being a musician is totally different skill.