[She has to stop and think about it.
Erika is a friend, but she's done this before.
Rin did a dumb thing and died, but she doesn't really care about him.
She had a plan that Dazai-dono had said was smart to keep Rin and Hiyori alive, but Rin messed it up.]

... True loyalty is proven by one's actions, words are meaningless.

[But she can't say she wouldn't have done the same, and lowers the book.]