You are talking about someone that spoke with a rather manipulated voice almost 24/7 for years. Of course she can act all day, every day. It's a big part of what her job was.
That's why I referenced that Fielder quote. Either she's innocent (unlikely) or she's an incredibly self-aware person with a remarkable degree of social intelligence. The image she's painting of herself is too expertly constructed for her to have gotten there accidentally, it's either the truth or a deftly orchestrated piece of fiction. You can't manipulate people to the level she has been accused of through nothing but dumb luck.
It's never as simple as "they are very self-aware" or the opposite extreme.
Maybe you all have to see the movie to understand what I'm saying. In many ways, the image she presents in the movie is nearly diametrically opposed from the image you have of Holmes going in. That shows she's very likely aware of the image she had previously. She's appears to be trying to counteract the narrative in such a specific way that it can't be accidental. It's more complicated than just her continuing to claim innocence, she's practically a different person in this movie. Someone like Trump could never transform themselves like that. And it is that transformation which makes me think she's self-aware.
Journalist Ron Jonson had the same experience. He went into a prison to interview a convicted... serial killer I think, knowing that he was a psychopath and having read up on how psychopaths manipulate people, and still came out convinced he was a poor innocent guy wrongly convicted.