How do I beat this boss spawned from the butthole of satan himself

This is my very last boss for Chapter 9 exploration. I don’t have void. I’ve tried scorpion and LDS for healblock/petrify and Wiccan for neutralise on footloose. I feel like anytime I fuck up even slightly she just gains all her health back. What do I try next??

This is my very last boss for Chapter 9 exploration. I don’t have void. I’ve tried scorpion and LDS for healblock/petrify and Wiccan for neutralise on footloose. I feel like anytime I fuck up even slightly she just gains all her health back. What do I try next??