Amber with 3a and how bad everyone else performed could very well have medalled at world. But no, she was not send because missing "body of work". And most certainly she will not be send to Olympics again even if she performed well, because of missing body of work, because she couldn't prove herself at world. How is she supposed to create a body of work, when she never will he send? The body of work principle is nonsense, it doesn't have any clear criterias, it only favours politicking and skaters with influancial coaches
The body of work is a controversial option because like you said a skater gets passed over for a competition for another skater who has a body of work, so it inhibits the first skater's ability to develop a body of work for in the future. However in the case of Amber - its not like she was a brand new senior skater last year and got passed over for established Karen Chen; Amber has been competing as a senior for 5 seasons and in international competition she's placed on the podium once at the CS US Classic where she finished third. Its not like she hasn't been given opportunities to prove herself on the international stage.
And let's be honest on Amber and the "triple axel" - she's only attempted it I think twice in competition, at Nationals last year (once in the SP, none in the FS) and at the Cranberry cup SP- Nationals was downgraded and Cranberry it was under-rotated. I have my doubts that a skater who is an inconsistent competitor would have hit it and everything else enough to medal at Worlds, her highest combined score internationally was at 2020 4ccs with 190.83; Trusova who finished third at 2021 Worlds scored 217.20, so Amber would have needed to improve her best score by about 27 points to surpass Trusova.
**To be clear, when the discussions were had regarding who would be sent to Worlds, I was in favor of sending Amber with the argument that it wasn't like Karen had some phenomenal international body of work, and that I thought it would have been good to send her because she did attempt the triple axel with a decent attempt, and the US ladies with the exception of a few juniors (and now Alysa who is a first-time international senior) have failed to push themselves technically to be competitive with the top international ladies.