Amber's poor performance at Finlandia was due to competition nerves. Amber has always been a nervous competitor and she relies on consistently strong performances to strengthen her subsequent competitions via confidence building. We witnessed this last season when she managed to hit clean short programs and semi-clean long programs; however, this was because she competed MANY times virtually, in-person, etc. Last season, Amber competed in the International Selection Pool Points Challenge, Skate America, and several club competitions before executing two stunning skates at the US Championships. Amber did not compete at all during this summer, withdrew from Cranberry (her first international event this year), and managed to be healthy enough to perform at Finlandia. For a nervous competitor like Amber, it is all about repetition and ensuring that she improves with each showing.
As for Karen, she's gaining consistency and strength with each showing. Once she manages to lay down clean short and long programs, Karen has a great opportunity to score 210 and upwards. Additionally, Karen's strength lies in her components and the judges, so long as she does not melt down, are willing to score her in the 69 and up range. With components above 70 and technical scores approaching 70, Karen's score ceiling increases drastically.
Thus far, I think it is immensely difficult to say that anyone is a lock for the Olympic Team (even Alysa). The ice is slippery and a single competition can change someone's entire trajectory. In terms of building reputation, I think Alysa, Lindsay, and Karen are doing a wonderful job. As for Mariah and Bradie, we will see them very soon at the Grand Prix.
I for one am ecstatic by the huge influx of talent in our junior division. Never before has the competition been so tough. I think this bodes well for the upcoming years and the US' future in figure skating.