The Discord "leak" was actually on purpose. You can tell that by far in the entirety of NijiEN, Petra is the only one who's actually into /jp/ and tried to refuse m*ale collabs with all her might. But alas she figured out that she signed for the wrong company way too late, so she prepared the chat room before that stream and pulled an "OOPSIE" as her own coping mechanism. Ot's quite clear that she's disappointed by her genmates and no longer comfortable being in the same proximity as them.