Yeah, saying that Toshimoko attempted murder against Hotaru is silly. You could argue that sparring drunk is idiotic and I totally agree but if indeed Toshimoko killed her, it would have been an accident. He never intended to kill her, he intended to bring a reaction from her and show that if he wanted to, he could definitely kill her. I mean, by modern society standards that’s really dangerous but I can totally see certain samurai teaching lessons to others like this. Anyway, everyone is entitled to their opinion, my opinion is that the only way Hotaru and Kachiko get BOTH alive out of this is by them becoming ronin and fleeing to a really far away place and even then, that’s iffy.
As others have said, her not telling Shoju about what happened puts her in the conspiracy.