You're comparing Mirai, a veteran of US skating, to Bradie, a newbie in her first major international event.
As the senior member of the US team, Mirai should have been a standout in all phases of the Olympics, but she turned in her best performance right off the bat at the team event and then phoned it in her performances in the individual segments.
As the most junior member of the team, Bradie skated well in the team event, and did better than Mirai and Karen in the individual FS event.
She was 0.14 points behind Karen in her FS. I don’t think she “phoned it in”. I wish I had links to her interviews in the media zone post SP - she was crying uncontrollably saying how she felt she “let [her] country down”. I am sure everyone has their own perception of the matter but anyone that upset surely did not go through the motions.