You’ve both finished your meals, and you think that’s the end of the dinner, but she surprises you and orders another entire meal to go because it’s for her next day’s lunch.
A user on the thread points out, “When you suggest a coffee, walk in the park, or taco truck, and she insists on a sit-down restaurant that isn’t a chain,” there’s a strong likelihood that she’s only in it for a free meal.
A surefire sign that her interest in you doesn’t extend beyond dinner is when she tells you that she has a prior commitment, has a friend stopping her house, or she’s meeting someone immediately after your dinner date ends.