If I had to speculate, I'd say the lady has 90% of the hardware that enables empathy, just that she doesn't feel pain, she cannot empathize with pain and thing

If I had to speculate, I'd say the lady has 90% of the hardware that enables empathy, just that she doesn't feel pain, she cannot empathize with pain and things deriving from pain, just like I can't empathize with bats using ecolocation. Perhaps she empathizes with other, more positive emotions. However, psychopats surely do feel pain, but they lack the hardware to feel the pain of others and much more. And sure, there's the fact that you can learn to voluntarily turn off your empathy.