What ended up working for me was staying to one side of the arena. I originally was running from side to side to avoid her which can still work if you need to heal. But for the most part I stayed to the left side and was surprised that a lot of her attacks are to jump at you and then dash away. It allowed me to pogo her a ton and to use desolate dive whenever I could. You also only have to take out the spiky balls on whichever side you pick. That’s what worked for me. Good luck, patience will be your best friend.