Her books had more natural words and it really didn't matter if you misunderstood a few words or a sentence. Plus because they had been simply translated from English you kind of picked up on grammar that made sense (you could squint and kinda knew the English behind it).
Great literature was the worst to try and read and learn from. I wouldn't try reading anything highly regarded as good literature. Just too hard.
Long books are a grind - I would probably avoid Harry Potter for that reason.
Comics were really hard - too many contractions and fake accents; also local comics often implicitly referred to local culture I didn't know.
Yup, the value of simple vocal training part (combined with active listening, and occasional feedback on what one does day) seems to be greatly underappreciated. And the value of flashcard-based vocabularly training - generally overrated (beyond the very initial stages).
That said, it seems difficult to even get to A1 without some actual formal understanding of the basic rules of grammar.