>It's just as likely that she is totally lacking in self-awareness, and that she simply does not know when to shut her mouth because she has no idea how stupid she sounds.
No, because she doesn't sound "stupid" in the movie. The mountain of evidence against her is so extreme that being able to carve out any narrative in which her innocence has any plausibility requires such a calculated and well constructed plan that is shows a high level of social intelligence and self-control. Fielder literally lives with her 24/7 for weeks and her mask doesn't slip. You don't have to believe her story to recognize she's not a "stupid" person who "does not know when to shut her mouth".
No, because she doesn't sound "stupid" in the movie. The mountain of evidence against her is so extreme that being able to carve out any narrative in which her innocence has any plausibility requires such a calculated and well constructed plan that is shows a high level of social intelligence and self-control. Fielder literally lives with her 24/7 for weeks and her mask doesn't slip. You don't have to believe her story to recognize she's not a "stupid" person who "does not know when to shut her mouth".