She's a distance runner so she's always been athletic. She's a total badass but kinda just acts like that's how everyone is, her whole family is like that. Exceptional but totally unaware.
She can't join the Rangers but she wants to. Imagine what it's like for her, watching lesser qualified men go up and be promoted while she is left behind. Her friends are other smart, talented people, so she seems frustrated they get to move on while she doesn't. In general she seems more determined to change it then upset about it though.