Trump made a big mistake in his response to Khan. Was it better or worse than Hillary calling the mother of Sean Smith a liar? Comey said she did not lie during the FBI interview. How does he know? He did not attend and she was not put under oath.
A sociopath may believe what she says when she says it even though it is clearly false. But that means they think they are telling the truth when they say something, ergo no guilty mind. So she did not lie. She just said things that do not comport with reality.
She married a sociopath at least partly because she is a sociopath.