>>280525310I don't think she was ever meant to be shown as actually stupid (her lack of teeth makes it sound worse than it is when she talks) but rather simple and somewhat ignorant of the world outside of what the other women in the camp have taught her.
If you listen to the words of her story as she tells them, it becomes clear she is a thoughtful individual who has had extended periods of self-reflection.
She knows she's in a horrible situation and even blames herself for some of it, but also is clinging to whatever she can to make it through as a fundamentally good person.