This boss in act 3 doesn’t really pressure your character’s stats very hard with her normal abilities. She has unremarkable hitpoints, and her basic attacks do little damage.
What she does pressure is your ability to dodge her special moves. Many of these will be ‘dodge or die’ if you have neglected chaos resistance.
It's typical to have little or no chaos resistance at this point of the game, as it is hard to come by early on.
Footage shows is from Act 6 (during Early Access, Act 6 is a second copy of Act 3) and on a character with 54% fire resist, 49% cold resist, 50% lightning resist, 21% chaos resist and negligible armor, evasion and block.
