My original stagger plan was never gonna work with those resistances, so I switched to using high bleeds as my win condition. She uses like 7 attacks a turn so it should be fine.
That weakness to all damage types from the mark and that Arcana attack got me a couple times but with enough damage spread and bleed I could outlast her.
So yeah, it took a couple tries.
First try: /watch/eb.utuoy=erutaef&4YzSMnxhO9Ohu
Workshop mod
Sound of a star: https://steamcommunity.com/sharedfiles/filedetails/?id=2147019369