This woman is a woman who does not believe Mrs. Carmody and is not one of her followers. She only appears in the film.
She is not present when Jessup is killed, nor is she present when Mrs. Carmody is killed while trying to kill David's group. She is also not seen watching David's group leave. As people from the market are very briefly glimpsed aboard the rescue trucks at the end, it can be assumed that the woman was rescued.