When I fought her it was going well, then during phase 2 during that wheel thing she got me in a corner and it wouldn't let me doge out and basically locked me into place. This one shotted joker and makoto. For the last like 1/8 of her hp I only had haru and no healing items. From there it was a slog of dodging everything and only hitting her 2-3 times when she's exhausted. I still won but sheesh it took a while.
I do hear it gets way easier after the first jail though so that's good.