She hasn't been shown to be any tankier than anyone else so far. She has been shown to have some level of extraordinary strength, though. It would closer to a rapier user vs. an arms warrior.
Kingdom: Creates super soldier with the strength of an army of natural disasters, capable of beating a demi-god to death in a fistfight.
Also Kingdom: Has harmed and mistreated the super soldier's sibling, and is about to reveal that fact to him.
Also also Kingdom: "Nothing bad could happen."
Nice revisionism, bro. It was the tribesman that got almost fatally high and started hallucinating, and then attacked the Nords that started this. Ivar didn't attack anyone, he defended Thorfinn FROM attack.
If only Thorfinn hadn't prevented everyone else from having the tools needed to protect themselves. Thorfinn's fingerprints are all over every dead Nord.