Which pair of terms best describes the female character as depicted in the excerpt?

We don't have the excerpt, so we cannot really answer your question.
I can help you a bit, however, so if you've read the story, you will know how to answer it yourself.
A flat character is the one who doesn't change at all over the course of a novel, whereas a round character develops and changes his or her characteristics.
A protagonist is the hero of a novel, whereas an antagonist is his "enemy.

I’m not sure what it is i sorry