She's made a point of saying that if she doesn't say otherwise, everything happened as in canon, so yes, Jet happened. A lot of reviewers have pointed out that this is a bad thing, like what you guys are saying about how she should say stuff and not just assume everyone's seen The Guru and therefore knows how wrong Zuko and Iroh are being.
That she REALLY needs to work on, since if you see the counterargument without the argument then the counterargument looks really biased. If you don't know canon or doing think about it exactly in the context of canon (which you don't with a lot of fics since they don't fit into the world well), then it looks really uneven.
So it looks like 'Zuko and Iroh are awesome, Katara and Aang are immature' instead of 'Katara and Aang, Iroh too, are awesome and Zuko is kind of an idiot (as we know from the show), but it's more complicated than that.' It becomes 'they're immature' instead of 'they're awesome BUT immature.'
This reader was among those who thought that Toph got kidnapped by the Dai Li (due to thinking that the kidnapped by her folks' agents happened before Ba Sing Se), so yeah. She needs to work on that. And she has a tendency to assume everyone reads every single word and remembers it and seems to think restating insults the reader's intelligence.
So after, in chapter 22, she had the conversation between Zuko and Jia about why Katara does not like him and he totally deserves this, 'I'd be throwing fire at her, she'd be throwing ice at me... I chased them all the way from the south pole and attacked them a lot,' she doesn't do it again. I suppose since all that's outlined in the show, which shows episode after episode of Zuko attacking, she thinks it's a given, but a lot of fics will ignore stuff like that.