She doesn't quite "get" popularity, but in universe she knows people like the pics of her in different outfits a lot, and if it makes people happy she will continue to do so(much to the detriment of Des' own wardrobe which Angie takes from a lot)

While she would be okay with it I think you'd run into the resting your head in her boobs problem first

Yes! I've had an idea that alot of her lounging outfits are those meme shirts from Japan where they're just like two english words in big bold text that mean nothing. Now idk if that counts as graphic tees, but those along with like the stuff you'd see at Kohls she looks at and goes "neat!" and picks it

She is unfortunately not, she enjoys watching people game but her brain power gives her the ability of a parent trying the WII with their kids