I think you make some good points here, but I disagree to an extent. I actually think some of Ambers issues with phrases and pronunciation can actually be BECAUSE she is a reader. There has been some correlations done between kids and reading. Studies have shown that some kids who read a lot gain word function and have a larger vocabulary but can fail when it comes to turning that into real like usage. You can read and learn those functionally but you aren't necessarily going to learn how to pronounce them. We even see this built into characters in film and TV at times. I often wonder when she speaks and stumbles over her words if she is trying to make an attempt to sound smarter or more worldly but simply fails.
Its not like she surrounds herself with intelligent people, and the kind of people she surrounds herself with are just as likely to mispronounce things as often as she is, so she cannot learn from others. Her talking to the camera might even be the bulk of the talking she does. Where is she going to learn or even notice she is wrong? Because of us "haters"? If anything I think that's why she digs in, like the youtubers who turn their common mispronounced words into a joke.
Like you I do find her lack or world knowledge as a supposed reader rather sad, but I am not surprised. I doubt she ever had anyone as an adult to guide her, and if she just picks up radom popular or well marketed books with no real attempt to branch out what is she going to learn? We've all met that person who ONLY reads a certain subset of books (like vampires, or romance, or sci-fi) and I'd assume her interests are similarly narrow. If she does in fact read to escape she isn't going to pick up a memoir or any non fiction book and she sure as hell doesn't strike me as someone who'd read the news.
I know exactly what you mean, but I don't think that's the case here. A kid or anyone reading the word, say, genre, knowing what it means and how to use it, but not hearing it, thus not knowing how to pronounce it is normal. As they hear the word more, they'll begin to say it correctly or be corrected by someone else. Some of the mistakes she makes are more idiotic, than, 'I read, but am unsure of the pronunciation' or using a word where another would've been better. Even the way she puts her thoughts together, at its worse, the phrases are just dumbly combined like 'scrumption down', 'sexually strived', or in the example I listed of 'smiling with air' that's poor articulation/lack of a vocabulary to pull from. That's more than, say, pronouncing 'subtle'(suttle/suh-tul) like 'sub-tul' and saying "he wasn't very sub-tle about it', which would be used correctly in the right context, but said incorrectly from not having heard the word. That would be understandable.
While not scholars, her friends do know basic grammar and can articulate their thoughts. What gets me is, we've seen Destiny and even mild mannered Becky correct her word usage, which points to them doing it offline, with the reasoning that, if they'd do it in a vlog for the public, they're definitely doing it privately. People joke about Destiny being stupid, but her grammar is generally fine. She has the knowledge that you'd expect from someone who graduated high school, even if she looks a bit slow and acts immature. Amber may not surround herself with geniuses, but none of them, that I can think of, speak more poorly than she does. Not Eric, Rickie, or even Dana.
To be honest, stuff like,'impreciating, 'inscrutiating', talking about how to 'storage' something rather than store it, her scale not being 'liable' (rather than reliable), basic grammar mistakes like not knowing the past-tenses of
common words, highered rather than raised, dogs having natural extinct, declaring she hasn't 'dranked' water, saying 'wroten' instead of written, and declaring ' I've never almost drownded" point more towards dull/dumb than anything else. That's how a 4 year old speaks, rather than a 14 year old *who might benefit from audiobooks.
* I see Becky has been located. That's an.. interesting haircut and she's lost a lot of weight.