because the quality being tested this round is self-love and this reveal combined with her internal monologue makes it pretty clear that Abi doesn't have a lot of that going on, especially since she seems to have based her look and persona almost entirely off of Ao and erased herself completely
Also, she is hiding it and obviously blames herself despite being the one that was wrong and went through the ridiculous effort of rebuilding her identity and image around the friend that betrayed her.
Plus she's projecting onto Fuwari and MC and trying to get them ejected because they "don't belong as idols." So it's pretty obivious that she's fucked in the head about the whole situation.
Obviously has some heavy self hatred and trying to impose some kind of punishment on herself. So the entire thing coming light would fuck with her head and probably also make her make mistakes and spiral downwards. Bassically even if it didn't get ejected by itself it will absolutely make her self destruct in someway.