Its CV Hime. She simply annoy the heck out of players through random taiha.
I know. And I said my 4th rate fleet got through her without any taiha. Let me re-check the composition. Okay, I had 11 sorties but I had no problem with CV Hime. All the times I had to go back was because my unstable internet connection decided to go off line right before boss node. But still, I just needed 5 times reaching boss to clear it. Composition was 73~75 Aoba, Ashigara, Myoukou, Shouhou, 80 Italia, 81 Chiyoda.