Did anyone harbor the illusion she would take responsibility for anything, let alone TA's murder? She was attempting to claim self-defense, afterall. I think there were collective eye rolls from the first words of opening statements by the defense.
I think it was an open question in the beginning, at least as to the extent of her denial. I think most people at least expected her to give something. As it was, she stood behind the discredited defense claim to the very end, up to and including at sentencing. I think most people found that somewhat surprising - or shocking, and yet consistent. In fact the only thing about her that was consistent.