Holy fucking shit, bitch of a fight
Ended up crafting the Triple Jump Boots just to be able to reliably dodge her double blizzard spike and triple dragon meteor, but it was worth it, especially once the little Selynes come out and all start throwing their own meteors + spikes
I was doing hard difficulty world setting, but the incoming player damage of 4.0 was too much for me so I set it down to 2.0. Outgoing player damage still at 0.5 though, so I couldn't just burst the little Selynes down instantly