She uses a move called 'In health' - each person hit with that lights up a letter on the floor, much like the grooms in Tam tara hard.
We had 4 letters lit up and 'Black honeymoon' hit us all for about 6k, causing a wipe. Our Armour is at +15/16

One letter was about 1k and easily healed through.

She also has a fear move - 'Cold feet' which I believe you need to look away from.

My advice is stay close to her, not too close but close enough to react to the floor markers, since 'In health' has 2 versions, Massive AOE with a small safe spot around her, or a medium sized AOE that you need to run from. The fights a more extreme version of the chimera fight I feel.

Hope this helps!