I think she and Duncan keep each other guessing. I think their morality is different. That's what I mean. Most of the immortal women are not portrayed as good guys. In the one sense, yes, I'm talking about the physical, but in the other, I'm talking about goodness.
Women survive in a warrior's game by being different kinds of warriors.
Just as when we had an immortal named Kenny who was an 800 year-old child, he survived using different tools. To do otherwise would defeat the essence of the show. Immortals are not super powered. It's not like saying this is Wonder Woman . They're just us, . . .